Previously my web addiction, besides the blogs and political commentary, has been the Internet Movie Database. I can hardly watch a movie at home without the laptop open and IMDB pulled up online.
For a few months, I've been lamenting the lack of a music version of this kind of database. I don't know why I didn't just do a google search before tonight, because when I thought to do that, I found AllMusic (by AMG - the guys who keep all the CD information that shows up on your burned CDs).
This is fantastic! Enter a name, and it pulls up several tabs, including Overview, Biography, Discography, Songs, Credits, and Charts & Awards. Within the overview tab, you'll see links to similar artists, influences, other writers whose songs they've performed, a timeline of their musical life, genres, pictures, etc. etc.