I skimmed over that list and it looks like Q2A does pretty well. Everything works fine without stylesheets, for example. Perhaps you can go through the list and tick off everything that you can test yourself? And we can help with any technical ones you're not sure of.
On the validation side, the avatars don't have the alt attribute and there is some odd Facebook HTML there, but everything else is fine. Validation isn't a huge deal, as long as the pages work, which they do.