Uh-oh, you missed the part about Do Not Post Links to your own page. But while waiting for the moderators to nip in and take action, I took a quick look. Among other things I found that
:: cough, cough ::
you must have added some stuff to the CSS after it passed validation, because it no longer does-- and the HTML validator made an even bigger fuss.
My preliminary hunch is that the divs don't add up right, so the validation icon that's supposed to be in the left column has ended up on the right.
* For some reason that now escapes me, I once had a look at the GA code. One single solid block of text without ever a pause for breath. You can only do that when you're absolutely positive you will never again need to change a single line.