I just clicked the link in IE7 and ended up at http://www.ober.com/publications/313-payment-matters. Correct?
I also looked around with the IE developers tool and didn't see anyone covering that area up... that was my first thought, every time I've seen some browsers clicking on a link and others not, it was some other element positioned over the anchor, and browsers differed on where they placed the link z-wise. Is it possible that content_wrapper was too wide earlier?
I'm gonna have to tsk you for the <div> </div> thing. Bah.