What Font Is - Find any font from any image (commercial or free)
Linotype - Linotype: Fonts for Desktop, Web & More
AMP Font Viewer - Jump to Download - Download.
Fonts.com - Fonts.com provides the biggest and best selection of high quality desktop and web fonts. Try, buy and download classics like Helvetica, Univers, Frutiger, Trade Gothic and Avenir along with popular new fonts like Soho and Neo. Find your type!
Font Viewer - Font Viewer is an application which does exactly that - it views fonts!
Google Fonts - Making the web more beautiful, fast, and open through great typography