Things I'm in:
soundarte.net
aelrsty webring
Synth DIY:
Electro-Music Lunetta Subforum
Richard Brewster's Electronic Sounds
Logic Noise
René Schmitz' Synth DIY Pages
Software/Licensing:
Richard Stallman's Personal Page
The Cathedral and the Bazaar
The GNU Manifesto
Nerdy Nights (NES Programming)
Musical Instruments:
Odd Musical Instruments
Polyphonic Workshop
Bart Hopkin
FretFind2D
Interesting Stuff:
LWN Penguin Gallery
A Complete History of Tux. (So Far)
So You Want To Be A Pixel Artist?
HobbitHouse Wood ID Site
Inuit Fermentation
DC Animal Circuit Bends
Alternative ways of writing English
Solarsonics