There’s a lot of great information in the font management software thread, but I’ll break it down for you.
For Windows users, FontHit looks like a pretty good solution. And you can also get Bitstream Font Navigator 5 by downloading the massive CorelDRAW Graphics Suite 12 Trial.
For Mac users, there’s a few crappy freeware apps and FontAgent Pro, which will set you back $100. But hey, you’re a Mac user so you’ve got money to burn, right?