During our musician lives, we found the resources below helpful.  Check 'em out!

1.  Musician's Atlas - http://www.musiciansatlas.com

A comprehensive list of everything from radio stations, promoters, and record labels to venue information and print publications

2.  The Indie Bible - http://www.theindiebible.com

Somewhat the same as the Musicians Atlas

3.  Lefsetz Letter - http://www.lefsetzletter.com