Digital Audio Formats information from Northeastern Massachusetts Regional Library System:

Web Site: http://www.nmrls.org/ce/digitalmedia.htm
WORD FORMAT: http://www.nmrls.org/ce/digimedia_HANDOUT.doc

A great source for information on digital audio formats, including: Audiobooks in Libraries; Audiobooks for consumer; Digital Music Downloads; Digital Music in Libraries; Digital Music for consumers; Digital Music for free!; Podcasts