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First off, suggesting all possible changes is quite broad. What are your goals with optimizing these sites? Starting structuring your e-commerce sites and laying down the user flow is a good start.
Have you taken a look at Moz SEO guide?: http://moz.com/beginners-guide-to-seo (updated with link tag)
Short and simple. I look forward to see the series!
If the domain name and URLs are the same, then you shouldn't worry. Prompt for an reindexation using Google Webmaster Tools to let Google know that the site has changed.
If URLs have changed, make 301 redirets to related pages.
I am guessing that you are using RWD and not a mobile site?
By the way, taking a second look at the code, I can see that you are not adhering to best practices when it comes to the header tags. See example from your mentioned page:
<title></span>Buy Abc Wine Glass Red Online India: Red Wine Glass by Ego Alter: Colored Glasses, Red Wine Glass: Urbandazzle<span class="html-tag"></title>
<meta <span class="html-attribute-name">name</meta <span>="description" content="Buy Ego Alter Abc Wine Glass Red at Rs. 5,225.00 online in India. Set Of 6 Pieces: The force and energy of the color red. Beauty is everywhere, if you know how to look at it: even inside a chalice, get ready to impress even the most distracted guest with gusto. These bold red wine glasses from the Italian house of ego alter are definitely the scene stealers.: Urbandazzle"/>
<meta name="keywords" content="abc wine="" glass="" red,="" ego="" alter="" red="" glass,="" buy="" alter,="" colored="" glasses,="" glass"=""></meta name="keywords" content="abc>
Take a look at http://moz.com/blog/new-title-tag-guidelines-preview-tool which will display where Google cutts you off in the SERP.
The length is now in pixels and does not follow the 50-60 /150-160 length for title and meta description tags. Also remember to focus the title and description on the user and convince them to buy (putting the primary keyword first off course in the title tag).
The meta name="keywords"? Ditch that all together. There is an option for that in Magento CMS. No search engines are using that anymore, and the only creates more code, thus slower page.
Use this Tool for testing the structured data: https://developers.google.com/structured-data/testing-tool/
Well, your issues are with tags and I would rather noindex them than using a canonical tag.
There are no reason for the search engines to find tag categories and it doesn't help a searcher either (on site it can be useful however).
rel="canonical" should be used for content which is similiar like a product with different attributes, a product with multiple URLs with the same content, or if you syndicate content from another site.
Remember that rel="canonical" is only good to use if you cannot hardcode your way out of it. If you can remove the need for the tag, by either removing the indexation of the tag category or making the blog function different, then that would be the deal solution.
Read about rel="canonical" here: https://support.google.com/webmasters/answer/139066?hl=en
Regarding Google AdWords, it counts the actual landing page that the user (bot) ends up at. So if you are redirecting from 1 page to another on your domain, that is perfectly fine. Google AdWords accounts for CTR, relevance etc. (see more here: https://support.google.com/adwords/answer/2454010?hl=en).
This means that the QS will be calculated using the landing page after all redirects, just remember to keep the number of redirects to a minimum due to load time for the user.
Another thing, if you wanted to make an ad which pointed to a redirect which did not work, your ad would get disaproved. Google AdWords will surely keep you notified if your landing page is not working.
Like Highland is saying, most often a redirect is used to track a click from AdWords, if they want to collect additional data about their campaign.
Well first off, the meta description is not something that Google will be forced to use and as far as I can tell, the description looks fine in the code.
_ "Google will sometimes use the meta description of a page in search results snippets, if we think it gives users a more accurate description than would be possible purely from the on-page content" _- from support.google.com: https://support.google.com/webmasters/answer/35624?hl=en#1 (I created a link that jumps to the specific section).
Regarding your issue with site command, remember to remove the space in between the command and the url. E.g. site:domain.com.
Subdomains are seperate from your root domain SEO. I guess that you do not want search engines to discover the new site?
Deploy a noindex tag on the site to make sure that it is not indexed in the search engines. However, if you place it in a subfolder on your site (e.g. domain.com/site/) I will affect the overall impression of the site from a search engines perspective.
You could take a look at the Moz guide about domains (it could help you understand the difference in subdomains and root domains in respect to SEO): http://moz.com/learn/seo/domain
I will recommend that you take a look at the Moz Guide on this topic: http://moz.com/learn/seo/international-seo
Google will differentiate content if it is served on a different domain in a different content. So a 1:1 relationship should in theory not create DC as long as it is not in the same language. However, I would take the time to make sure that the content is written properly in the right tongue and take into account local cultural aspects.
Which method are you using?
or
For urbandazzle.com:
Well, I can see that you have thought about some basics, e.g. making a clean structure in the menu and categories (you should remove the .html suffix if it is possible).
A clear issue that you should be aware of, is duplicate content. I can see that you are using Magento and with my personal experience with Magento is that you easily create duplicate content with your products.
Check to see if your products are appearing in multiple categories with different URLs (just briefly looking at the sites did not pose any issues), and especially with featured products.
I can see that the products I looked at, did not include its own category and was placed closest to the root domain: http://www.urbandazzle.com/divider-container.html. That is great and follows best practices, dealing with a lot of products like you do.
When you are sure that DC is not an issue, I would look at the performance of the site. Using different tools, the load speed was quite high. Are you using a CDN or compression methods on your static files?
Take a look at:
http://tools.pingdom.com/fpt/#!/cJJ3p6/http://www.urbandazzle.com/ and http://gtmetrix.com/reports/www.urbandazzle.com/r910gWNk
For gobol.in it is almost the same walkthrough. When dealing with a massive index of products, you must make sure that each product is unique.
If you want to rank for a certain product, each product must have a unique URL and proper content.
Another thing, how are your users behaving on your site? What are the conversion rates and could you leverage UGC in terms of reviews and video?
These are just some of the things on top of my mind, that I think you should take a look at.
Do you mean that Magento adds a prefix on your meta descriptions? Or do you mean that the category is included in the URL?
Just wanted to make sure that I understand it correctly, and I think that you ask about the meta description tag. Have you taken a look at the meta description field in System => Configuration => Catalog => Search Engine Optimization?
You could also take a look at the sidewide settings for the tags: http://www.screenpages.com/wp-content/uploads/2012/05/Generall-Config2-580x324.png
What is your URL?
Sure, I can see the issues there. Having a look at the sitemap and submitting that would be my best guess.
Well it should be empty, but I don't see any problems with this page in particular: http://www.dutchgrown.com/fall-planted-bulbs/tulips/tulip-arma.html
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Are there a description that you could show me which contains the prefix? By the way, you should be careful using the category option for your products. Especially with Magento, you can run into Duplicate Content issues when you have the category as a part of the product URL.
I wouldn't change it. The benefit of sacrifising browser support is minimal to none.
I would instead focus on decreasing load speed, creating better content or looking at schema markup (if it is relevant).
What is the URL?
Most often the problem with Magento is DC and the recommendation is to use /category/subcategory/ for breadcrumbs and normal navigation and then use /product for the actual product page.
I agree that common UX dictates that it should more like, /category/subcategory/product, but Magento (and other e-commerce CMS) have issues with making more than one URL for a product.
I would stick to /product and make the necessary 301 redirects.
Sure no problem. That is what I would do ín that case. The best theoretical thing is to redirect all URLs to the best matching page and use /category/subcategory/page and make sure that DC is not an issue. However, with Magento, I have seen many issues with redirects going bad, and my strategy is now more time focused 
Well, you could be present with a local result, organic and paid (AdWords) and have different pages with variants of your keyword rank for that term.
What is the URL of your site?
Try to have a look at Dr. Petes analysis of the SERP: http://moz.com/blog/the-incredible-shrinking-serp
