1001 Fonts — Lots of great free fonts and dingbats. (Beware: lots of pop-ups.) 1001fonts.com

 Abstract Fonts — Another free font archive. You can view the entire character set of the fonts before downloading. AbstractFonts.com

 Better Fonts — The "user friendly" font site. Easy to scroll through lots of fonts quickly! BetterFonts.com

 DaFont.com — A large collection of nicely categorized and sub-categorized fonts (e.g. "Script" category has Calligraphy, School, Handwritten, Brush, Trash, and Graffiti; "Foreign" category has Chinese, Japanese, Arabic, Mexican, Roman, Greek, Russian, etc.) Beware, lots of popups and ads. Also has a "Top 100" category of the most popular fonts. dafont.com

 Dingbat Pages — Tons and tons of dingbat fonts. dingbatpages.com

 Famous Fonts — Fonts from TV show logos, movie logos, and other logos. smackbomb.com/famousfonts

 Font Freak — Quick navigation for finding the font you want from this large collection fontfreak.com

 Fonts500.com — The 500 most popular free fonts, based on download counts from several font archives. Very basic site, no previews per se. fonts500.com

 FontScape — Incredible directory of categorized fonts (mostly commercial). Find fonts that look like LCD display, Neon, or even fonts specifically for Posters, and many many more. Dozens of categories. Very handy! FontScape.com

 Free Typewriter Fonts — Over 70 free fonts that look like they were written on a typewriter.  Free-Typewriter-Fonts.com

 IdentiFont — Identify a font from a sample by answering a series of questions about the font characteristics. IdentiFont.com

 Killer Fonts — Fonts by Killers. More specifically, the fonts made from the handwriting of outlaws, presidents, maniacs, and rock and roll stars.  killerfonts.com

 Letterhead Fonts — A great collection of very nice commercial fonts. letterheadfonts.com

 Linotype — Purchase lots of great fonts here. linotype.com

 MyFonts.com — Commercial fonts, view by category, popularity, etc. Useful index of fonts. MyFonts.com

 Only Free Fonts Site — Another free fonts site, this time sorted by designer. freefonts.fateback.com

 Typenow.net — Another site with tons of free fonts. typenow.net

 Typical Type Design — Sells about 130+ high-quality dingbat and symbol fonts, at very low prices (less than $10). typicaltypedesign.netfirms.com

 Urban Fonts — A nicely-designed and well-categorized collection of free and commercial fonts. Mouse over the font to see the alphabet, or click to see the entire character set, which makes it easy to see if the font has a special character you need. Variety of useful custom previews. urbanfonts.com

 Web Building: Fonts — Great hints and font links. web-building.crispen.org

 WebpageFonts — Yet another page of 6,500+ free TrueType fonts to download. No categories, just a straight alphabetical list. webpagepublicity.com/free-fonts.html

 What the Font? — Identify a font by uploading an image sample of the font. MyFonts.com/WhatTheFont