Links to great font resources:
Dafont.com - Archive of freely downloadable fonts. Browse by alphabetical listing, by style, by author or by popularity.
Free-Fonts.com - Search engine for fonts which contains more than 55.000 fonts - truetype, opentype, postscript type 1 typefaces.
Luc Devroye - An encyclopedic site about typefaces and type design, managed by Luc Devroye.
WhatTheFont - Submit an image to WhatTheFont to find the closest matches in Myfonts.com database.
Top 20 Fonts - Listing of sites offering free font downloads.