Audiobooks
Commercial Sources
Audible http://audible.com/adbl/site/homepage/home.jsp?BV_UseBVCookie=Yes
Overdrive http://overdrive.com/
Learnoutloud.com http://www.learnoutloud.com/
Simply Audiobooks.com http://www.simplyaudiobooks.com/
Audiopolis http://www.audiofilemagazine.com/audiopolis/
Free Audiobooks
LibriVox http://librivox.org/ (volunteers devote themselves to the “accoustical liberation of books in the public domain.”)
Project Gutenberg’s Digital Literature Archive http://www.gutenberg.org/browse/categories/1
Audiobooks for Free http://www.audiobooksforfree.com/screen_main.asp (mostly classics catalog)