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I'd avoid article directories. They are not bad, but from a value standpoint, guest blogging has more potential. Either way you should be creating unique content. If you contact the bloggers prior to creating the material, then you can almost guarantee a spot on their blog by writing about what they want on their blog. It's always better to have people in place willing to "buy" your info before you spend time writing the article.

Justin Briggs uses a similar strategy for his info-graphics. He details his strategy here:

http://www.seomoz.org/webinars/effective-link-building

This explains the link re-routing issue in more detail:

http://blog.thenetimpact.com/2009/10/how-to-track-facebook-ad-traffic-using-google-analytics/

Sitelinks are just shortcuts to website sections, which provides easy navigation for searchers.

Having a sitelink wouldn't hurt unless you are specifically targeting one landing page for people to enter your site.

You will see different statistics for each SEO tool. Some don't take into account linking domains that are spam, some do. Some don't count duplicate domains, some do. Etc.

The same thing happens with traffic statistics. GWT and Google Analytics rarely line up on site traffic numbers. It's more important to follow trends over time than the actual numbers.

http://www.seomoz.org/q/is-da-a-reliable-domain-metric

Check out this article:

http://www.conversionvoodoo.com/blog/2009/03/step-by-step-guide-to-google-analytics-for-beginners/

There is a good discussion related to your topic in the comments section of this post:

http://webmasters.stackexchange.com/questions/3145/https-best-practices-for-seo-and-usability

"...and will be working with an external agency."

The external agency should have their own consulting strategy.

If you need information about how to view your website from a consultant perspective, Danny Dover's book is a good resource:

http://www.amazon.com/Search-Engine-Optimization-SEO-Secrets/dp/0470554185/ref=sr_1_1?ie=UTF8&qid=1313596634&sr=8-1

Everyone has their own method.

-I'd start with a quick site audit. Make sure you have content that people will link to, a solid graphic design, and a good UX.
-Determine who is your target audience.
-Decide who are your main competitors.
-Research what your customers are calling your services.
-Research what keywords your competitors are targeting.
-Find out what variations of these receive the most traffic with the least competition (SEOmoz Pro Tools/AdWords Keyword Tool/Others) 
-Pick your metrics to track. Have a way to separate web conversions from other sources (a separate email, phone #, feedback form, etc.)
-Fix your internal site issues (canonicalization issues, Meta Robots, no Meta Description, etc.)
-Optimize your site for your targeted keywords and a strong UX.
-Start gaining external links
-Continually test keyword variations and add new content
-Compliment organic campaign with a PPC campaign (optional, but it's a  good way to quickly test keywords).

I'm sure I left out several steps. But that gives you an idea.
And there are many ways to complete each step. Many ways to build links, do competitor analysis, perform keyword research, etc.

If you ask ten people, you're going to get ten different answers. I'd find an external agency that you can trust and let them do it their way.

I imagine Google uses the same techniques for blogs that they use for AdWords, which are:

-Domain

-Search Term

-Physical Location (IP Adress)

-Google Search Personalization

The following link explains it in more depth:

http://adwords.google.com/support/aw/bin/answer.py?hl=en&answer=6401

I agree with everything John said, especially the text.

And your meta description is too long:

"Internet marketing specialists online media direct are experts on all internet marketing services. We specialise in providing marketing to companies who ..."

Ryan Kent is knowledgeable and he is always contributing good information. I don't know if he is taking on any clients, but he'd be worth contacting.

http://www.seomoz.org/users/profile/312503

You have a trailing slash canonical issue. There are two version of every page on your site. The slash version and the non-slash version.

Find out which version has the most links going to it. Using Open Site Explorer is one way. And then 301 redirect all of the pages from the less popular version to the more popular version.

Directions for a 301 redirect can be found in the Web Developer's SEO Cheat Sheet:

http://static.seomoz.org/user_files/SEO_Web_Developer_Cheat_Sheet.pdf

The first is talking about Meta Descriptions. The second is talking about Meta Keywords. Two completely different things.

Meta Descriptions are important. Meta Keywords are not.

The home page, from my perspective, has too much information. One section is diabetes. One is osteoporosis. Another is Vitamin D. And that isn't even half of the front page. This combined with the two-column drop-down navigational buttons is a lot to process.

The drop-down tabs and rollover images appear instantly making the website interface feel jumpy.

I'd focus on simplifying the front-page and having less internal links directly off the home page.