free fonts:
http://www.fonts500.com
http://www.smashingmagazine.com/category/fonts/
http://www.betterfonts.com/
http://www.dafont.com/
http://www.urbanfonts.com/
http://neatfonts.com/
http://creamundo.com/ (9800 fonts)
http://www.1001freefonts.com/
http://www.abstractfonts.com/
http://simplythebest.net/fonts/
http://openfontlibrary.org/
http://www.typenow.net/themed.htm (themed)
http://www.searchfreefonts.com/
free font managers:
http://www.adobe.com/products/atmlight/download.html (Adobe Type Manager Light)
http://www.linotype.com/fontexplorerX
http://members.ozemail.com.au/~scef/tft.html (The Font Thing)
http://opcion.sourceforge.net/ (Opcion)
identify a font:
http://www.identifont.com/
http://www.myfonts.com/WhatTheFont/
type tester:
http://typetester.maratz.com/
brand names:
http://www.brandsoftheworld.com/
create your own font:
http://www.fontifier.com/
http://pentacom.jp/soft/ex/font/edit.html (FontEditor BitfontMaker)
got one to add? let me know in the comments!