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Are you logged into Google?  Do you have search history enabled?  What is your geo targeted location?

Any of these can drastically change the rankings you will see.  The effects of personalized search.

The fact that you are seeing a higher ranking in your results than what SeoMoz reports leads me to believe one of the above issues is causing your issue.

I usually have multiple browsers just for this purpose.  I tend to have at least one browser that I almost never use for the purpose of "checking" rankings(opera or safari).  I usually clear all cache and history from the browser to anonomize the results as much as possible. As well as to make sure that I'm not logged into Google.

Hey Edward, at first glance I don't see anything extremely out of place in your WordPress implementation.  However I did notice that you have a sitemap on your main site, but not on on the blog.  I've found my new pages always get indexed faster when using a sitemap that is submitted to Webmaster tools.  Possibly the addition of a sitemap to the blog would help.

Hey Guy,

I agree with Dorthea and Matt above, that both the newness of the site, and the freshness of blog content can be major factors.

To answer your initial question, no I don't think the Wordpress setup is causing the issue.  I think more than likely there is the possibility of an issue with your homepage.

There are so many little things that add up to a properly coded site and Wordpress takes care of a lot of that for you.  If your main page is a different type of CMS or statically coded page there could certainly be some basic issues that we can't address without seeing it.

I would definitely recommend that you plug your site into webmaster tools and take a look there, maybe that can give you the insite you need.

Hey Lisa,

Don't worry about the redirect.  Just go to webmaster tools and input the non www version of your site and go through the verification process.  Use the same method to verify that you did for the WWW version and you should be able to set the preferred domain after that.

Sincerely,

Paul