Jack William Bell's Journal: 1001 Fonts

1001 Fonts has easily more than an thousand and one fonts available, well categorized, rated and searchable. The site UI is well-designed (except the front page) and makes it easy to select the fonts you want. Most of the fonts available for download are freeware and the license terms are described for each font.

Useful as hell when you want that special font. But cool to just browse on a rainy day as well...