SearchMusic.com ~ Is an excellent resource for about every category regarding music you can think of. This is a great place to start regarding bands, musicians, luthiers, music videos, lessons... you name it chances are you will find it here.
Harmony Central ~ This is a one stop find it shop. Full of product reviews, tips and tricks.
Top 100 Guitar Sites ~ A very complete resource index consisting primarily of links to the most popular guitar related sites.
Guitar Player ~ A magazine devoted to Guitarist. Not much explanation needed here... most of us have a stack of em'.
Guitar World ~ Another magazine devoted to Guitarist. Lessons, equipment reviews and the latest scoop.
Modern Drummer ~ Can't leave our drummin' buddies out. A magazine just for them.
Feel free to email me and suggest good music resources.