Musically useful or just plain interesting; here are some links...
StewMac - Tools and ideas for guitarmaking
A fast music distribution service - sign up here
Bare Knuckle Pickups - Hand wound and in the UK
The Flash - an online community radio station
Music from Stryngs
Aubitt Recording Studio
Rick Beato - Music Theory and Tuition
A great recording tutorial site from Warren Huart
Spiked Magazine - Humanity is underrated