Font size problem following upgrade

Hi guys. I just upgraded to 1.5.1.2 from a 1.5 nightly beta. It had been working just fine for 6 months, but now I wanted to upgrade. So I did and everything seemed to go well, except for the Links Section. For some reason, it makes my Link Categories font bigger. It looks funny, especially in IE. The website is https://www.ohgizmo.com

I have no idea where to begin to fix this. PLease help.

Thanks.

D.