Check out this guys profile http://stackoverflow.com/users/391047/dave one of his answers is moved to the right. This popped up for me on the main stackoverflow page and the formatting became all screwed up. I can take a picture of it if you like.
Dont mind my custom css lol
EDIT: Tested Jeffs link in chrome and still got the same error. Below is a screenshot in IE7
I can just drop it, it doesn't matter to me. I'm just curious as to why this error is occuring. I had my collegue beside me check out the page and he got the same error, so its not just me.