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1)  Best way to redirect all new URLs sitewide

Page to Page redirects is the best solution, even though it's a major pain. I would take a look at your traffic data for at least the past 90 days, possibly even further, and create a 301 map from every page with inbound traffic to the correlating page on the new site.

2)  The prudence of heavily editing product listings at the same time of redirecting the URL (i.e. updating product descriptions)

If you're up to it. However if rankings drop then you won't be able to track it back to a particular change.

3)  Site structure:  Should I strive to keep the new site link structure as similar to the old as possible?

If the current site structure converts well, then maybe you should stick with it. The nice thing about switching to a new platform is it's a great opportunity to reinvent your site if you feel like it needs it.

4) Resources or guides on transitioning a site from a SEO perspective

This article might be a little dated, but it should point you in the right direction. http://www.seomoz.org/blog/10-things-relaunch-your-website

Good luck!

A site with PR4 and DA43 can't hurt, right? If it's related to your category, the link is definitely worth it.

Those are the top three for any website. You might consider joeant.com or a few of the other high-ranking directories.

Also added the BBB to the list, thanks to this article.

With google shopping you want to focus on writing good focused titles, and include as much detailed product information as you can.

A keyword focused title will help your ad become more relevant, but it won't do everything. Also, If you use the optional product detail fields you'll show up when user filters their results, where someone who doesn't include those details will be lost.

First of all, good links are hard to come by. Either you know someone, or you can pay a lot for a review fee.

BOTW is probably near the top of any SEO's inbound link checklist. If you have the budget, the $150 is worth it. Although your category might not get a lot of traffic, you still earn an inbound link from a new domain, which provides some upward pressure on your search listings.

That refers to the number of inbound links, linking domains, and linking C blocks that point to a specific page.

Basically getting more links to your page about blue widgets will increase that pages rankings.

It doesn't sound like you're being deceptive, just trying to provide a better user experience.

In general, if you don't feel comfortable explaining what you're doing to a google employee, you probably shouldn't be doing it.

In my opinion, what you're doing is fine, and I wouldn't have a problem doing the same.

That's odd. I don't see it either. Perhaps you should send in a support request.

So you wanted to know if they will show all shares and recommendations or just selected shares, etc?

I haven't seen any shares that were "ignored", but of course how could you really tell anyways?

I think if the SEOmoz staff wanted to try an experiment, they could look at the top 10 results for a single term and have a whole network of friends share those pages, then look at the results again and see if all of them have shares.

Obviously you can look at PageRank, Domain Authority, and a slew of other factors, but I don't think there will ever be an exact metric to determine the value of a link.

Recently google has really downplayed the importance of exact match domain names. If the domain name is newly registered it probably hasn't earned any links yet, and therefore wouldn't pass any SEO value.

A great article. I'd suggest you read through that post completely.

It sounds like you want to find some way of integrating the videos with their current e-commerce site, but you don't want to push the category links below the fold and ruin the user experience. Is that correct?

I think the best way to do that would be to way to do that is to have a separate page for the video and transcription, as well as the sharing icons, etc. Then, create a thumbnail image to place on the relevant landing pages and include a short description so that it fits nicely within the site flow, but doesn't move the content too far down.

Another option is to have a link to the video page using a header banner (468x60) or similar with a clean call to action. That would only push the page content down 70 or so pixels.

If you're in position one, you probably want to hold onto it. I don't think it would hurt to do something like that but I wouldn't worry if you're fairly competitive already.

I think the real benefit might be in picking up some long-tail keywords if that's what you're going for.

You can connect your accounts through your Google Profile (the stepping stone into their social network Google+) and the connections are pulled through those accounts.

'm thinking that by linking out to Mobile Casinos and Polish Rock Bands, he's probably losing credibility.

Google says they don't count nofollowed links, but of course they say a lot of things. If it's a link you really expect absolutely zero traffic from, don't waste the time working for it. That being said, if you're building links that will never drive traffic, maybe you should rethink your link strategy.

I don't think that should be an issue. The only time it would really be a problem is if you were doing "sniffing" for google bot and then displaying something different all-together.

The canonical tag isn't a bad idea either.

There isn't a specific penalty, but you are diluting the flow of "link juice" by linking to everything from your homepage.

If you've ever heard of link scultping (a bruce clay technique), it might be of use here. Basically you have your top menu items as normal text links, and the lower levels are pulled in through javascript so the search engines don't spider them.

It gets a lot more complicated than that, but at least it will point you in the right direction.

The most common services we see through addthis are actually facebook and email.

zharriet has a good point. You could really do the same thing with a few icons and skip the javascript.