Free Font Fiesta - A very LARGE font site maintained by Marry Forest. Free fonts, shareware, font utilities... This site has it all.
Linguist's Software - A foreign language font foundry, has a large selection of fonts for just about any language.
Giedi Prime Fonts - A very good collection of science-fiction/fantasy fonts.
The Matrix - Another science-fiction font site, with probably the most complete collection of fonts for Star Trek fans.
Old English Fonts - An excellent collection of fonts for recreating Old English texts.
The Font Pool - Over 1,000 categorized TrueType fonts.
Type Links from Phil's Fonts - A comprehensive set of links to font foundries.
Serif - Serif: The Magazine of Type & Typography is the premier periodical for the typographic arts. Published on a quarterly basis, it has received praise from around the world for its coverage of the design and use of type. Its typographic design competition has attracted top designers from around the world with previous honorees including Robert Slimbach (Adobe Jenson) and Copenhaver.
Fonthead Design - A good font foundry, tending toward modern tastes.
Scriptorium - An awesome site! Lots of images of fonts so you can see what you're getting. Lots of free downloads and good offers on CD collections.