The Lyrics archive has lyrics for a large number of songs, making it quite invaluable in digging up your fave band's mumbly verses. The Ultimate Band List is the most thorough music site out there, allowing you to browse a list of bands alphabetically, find the exact info you want, and suggest any sites not listed. Another rather large site is Rocktropolis . It houses some of the bigger pages for some bands. HyperReal is a good techno 90's sort of site.
Amazon tends to sell CDs at cheaper prices, though.
Listening to the music clips of CDs you might buy online is very cool. Cover art and track listings, too, in case you don't know the names of albums. Banned ad server hosts. A Sleeping Giant .