UrbanFonts.com for free fonts

If you only have one bookmark for free fonts, this is the one to use.

UrbanFonts.com has all the fonts you'll ever need. They tick all the right boxes for a font site:
Quality - They keep out the dross so you get a manageable selection of good fonts
Easy to browse - Fonts are organised in useful categories (see below)
Good samples - There's a nice big grab of each font, means more scrolling but better quality
Articles - giving you advice on selecting fonts

If you need a little bit more distinction, UrbanFonts also offers a selection of affordable high-quality fonts.