IE8 CSS Pages not centered

Last night I noticed that IE8 was rendering some of the pages on my site with no left margin. They are not centered like the are in FF. At least that is what it appears like.

I normally work in FireFox, so this was the first time I noticed it. Not sure how long it’s been like this, or how to fix it.

Here’s some URLs where you can see the problem.

The home page ( displays just fine.

Does anyone know why this is happening
or what I can do to fix it?

I know just enough to be dangerous.

Thanks in advance!

IE is in quirks mode. Try removing the comment at the top of the page. IEs 7/8/9 in standards mode all work as expected.