Google Font Directory
The Google Font Directory lets you browse all the fonts available via the Google Font API. All fonts in the directory are available for use on your website under an open source license and are served by Google servers.
Thinking With Type
This site is the on-line companion to the book Thinking with Type: A Critical Guide for Designers, Writers, Editors, & Students, by Ellen Lupton (Princeton Architectural Press, 2004). The book includes essays, examples, and practical guidance that does no
The Elements of Typographic Style Applied to the Web - a practical guide to web typography
DaFont.com
Archive of freely downloadable fonts. Browse by alphabetical listing, by style, by author or by popularity.
The Tao of Mac - Fonts