Open Font Library - The mission of the Open Font Library is to promote your freedoms as it relates to the use of type.
What Font Is - Find any font from any image (commercial or free)
Dafont - Archive of freely downloadable fonts. Browse by alphabetical listing, by style, by author or by popularity.
AMP Font Viewer - Jump to Download - Download.
Google Fonts - Making the web more beautiful, fast, and open through great typography
Font Viewer - Font Viewer is an application which does exactly that - it views fonts!