Linotype - Linotype: Fonts for Desktop, Web & More
What Font Is - Find any font from any image (commercial or free)
Google Fonts - Making the web more beautiful, fast, and open through great typography
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!