While I do try to keep my font collection somewhat under control, I am often looking for new fonts for graphic design projects. I usually stop by Jos Buivenga's exljbris Font Foundry on a search, which offers 13 well-designed font families for download.
The foundry's fonts include the hugely popular Museo font and Anivers, originally created for Smashing Magazine. While all of the fonts have at least one free style, you'll often find yourself coming back to purchase the full font family. Check out samples of each exljbris font along with links to download each.