Updated - "Mark as Read" added to forum home, fixed w3.org validation errors.
@Shackmaster - you have some other plug ins installed which are causing the errors on readi.mobi. Unless you have a .mobi domain name, I wouldn't worry too much around this. Much more important is validating on
http://validator.w3.org If you do want to tweak for ready.mobi, that can be done but you'll need to remove plugins and tweak the DOCTYPE (which I think there are instructions to on the forst page somewhere)