Bizarre IE Discrepancy

In this site: (I didn’t design it and I’m almost ashamed to say I worked on it, but that’s work)

can anyone tell why this page:

has a display problem that no other page has? I have done some pretty fine-grained work trying to figure out what is going on and so far it is defying me. If it gets corrected soon I’ll retract this message, but right now I’m too tired to look at it any more.