Websites which helped me a lot

Computer technology

Good programming tutorials, Java, python etc
www.zetcode.com

Emulation tutorials covers NES, GB.
http://codeslinger.co.uk/pages/blog/wordpress

OpenGL, 3d game tutorials, NeHe ( Neon, Helium)
http://nehe.gamedev.net/
http://www.gamedev.net/

Game competition
http://www.ludumdare.com/

Indie Games
http://www.tigsource.com/

Game development resources like arts, music

http://www.ambrosine.com/resource.php

For geek computer users
http://www.geek.com/

Good Linux stuff, books etc.
http://www.linuxtropia.org/




Science

Very good tutorial on Waves and signals
http://www.doctronics.co.uk/signals.htm

Science projects - for science lovers
http://www.scitoys.com/




Music

Mod, XM, IT, S3M Module musics
http://www.modarchive.org/

Game music remixes
http://www.ocremix.org
http://remix.thasauce.net

Game music collection
http://www.gamemp3s.net

Snes music collection
http://snesmusic.org/v2/

Emulators, console musics, roms utils etc
http://www.zophar.net




Arts

Ocean of artists
www.deviantart.com




Hardware

Hardware projects, circuits, pin-outs
http://www.epanorama.net/
http://www.pinouts.ru/




Books

http://safari5.bvdep.com/
http://www.gutenberg.org/
http://www.bartleby.com/



Research papers
http://arxiv.org/

Others

Lots of free contents of almost everything, must visit
http://www.freebyte.com/