Gearslutz: Simply put, the best pro audio forum. Whatever you need to know is in there.
The Gear Page: Awesome guitar forum.
Reaper: My choice DAW. Very lively community.
KVR Audio: Great resource for plugins
Tweakheadz: This writer definitely knows what they're talking about. Great info.
Slipperman's Guide to Recording Distorted Guitar: AMAZING! Read it.Pro Sound Web
Pro Audio Files
Pro Sound Blog: love this guy's writing
GuitarFetish: Great selection of guitar gear, AND they make stellar pickups.
Guitar Electronics: More great products, wiring diagrams, and more!
General Guitar Gadgets: GREAT resource for guitar pedal builds, and general electronics schematics
DIY Stompboxes: more great DIY stompbox and circuitry information
Geofex: More amazing pedal info
AMZ Guitar FX Projects: Great schemata!
AMZ Guitar FX Blog:
DIY Guitarist: Great stuff for all things DIY guitar!
New Sensor: Quality parts, switches, enclosures, vaccuum tubes, much more!
Free Stompboxes: Another great DIY stompboxes forum.
Audio Pages: More DIY articles
Home-Wrecker: Sister site of Runoff Groove, great articles and schematics!
Runoff Groove: DIY, articles, schematics, and more.
Tonepad: Prefab kits, more DIY.
Indie on the Move: Terrific list of venues and touring resources.
Ultimate-Guitar: I write articles for them. GREAT tabs! There is some great info to be found
Uber Pro Audio: Outlines gear rigs for famous musicians, mostly guitarists and bassists. Some drummers. Fantastic resource.
GuitarGeek: They let the site gather dust and will randomly update it every 5 years. What information that's there is great though
Jamtracks: This is a great site that offers backing tracks to solo over. A great assortment of meters and styles.
Premier Guitar: Great magazine!
This is a list of articles I've found around the web that really enlighten and inform on all aspects of music. Descriptions beside each link.
Creating Realistic Drum Parts via Samples: Tips and information on making drum parts assembled with the variety of sample programs available more realistic.
Avoiding Intersample Peaks: Inter sample peaks and how they relate to master clipping in your finished mixes.
Issues with 0dBfs: A great read on how the levels of your mixes translate to different playback systems.
Black Viper: This guy is the Yoda of digital audio recording. Read every letter in his site and then commit it to life. He is a master.