Here's a great article on making accessible WordPress themes, including the authors own theme. The article is titled Surprise! Your "semantic, accessible, search engine friendly" WordPress theme is none of the above.

www.bushidodesigns.net/blog/semantic-accessible-seo-friendly-wordpress-theme/

In addition to the theme, the article provides good insite into making a web site/WordPress blog accessible.

I like the theme, but although it's a bit bare. Adding a bit of color and it looks great.

I am no expert on checking accessibility of web sites, but I use a couple tools that can help quickly check web pages:

1. Install the Fangs extension in Firefox (available at http://sourceforge.net/projects/fangs). Then, from the Tools menu, select Fangs. You will get a page as "seen" by someone who uses a screen reader. Screen readers can be set to read the "headers" on the page, allowing a blind visitor to hear and scan the headlines like visual visitors do. (You may have to select "Settings" then "Sectioned" to see the blue highlights for the headers.)

2. Check pages online at:
http://checker.atrc.utoronto.ca/index.html
The Adaptive Technology Resource Centre at the University of Toronto provides this service to quickly check web pages. While it is often hard to get a page to rate completely accessible, this site really helps find your blatant mistakes.