Site review for Webnauts Net

While we strive to comply to WCAG 1.0 AAA and to the Communication Technologies Branch of the United States National Cancer Institute guidelines for accessible and usable web sites: Observing Users Who Work With Screen Readers, we would appreciate to get pointers to Accessibility problems you might discover on our new web site http://www.webnauts.net/

Any other problems, as operating systems & browsers compatibility, markup, semantics, etc would be same highly appreciated.

Please exclude reviews for our Blog or Forums. They are external software and not optimized yet.

Thank you in advance for your kind support.