Art & Entertainment 

Edtropolis (forums)
Los3Eds.com
DeviantART
Side7.com
CoolMiniOrNot.com
FanFiction.net
Games Workshop
Black Library (forums)
Confrontation Games (RackScan)
AnimeMusicVideos.org
YouTube.com
AlbinoBlackSheep.com
Corbis Stock Photopgraphy

Computers 

Apple.com
UbuntuLinux.org
GNOME-Look.org
GNOME-files
Open Web Design
Open Source Web Design
ThePirateBay.org
MiniNova.org

Search Engines & Wikis 

Wikipedia.org
Google
The Altavista Babelfish
Google Earth
The Ubuntu Wiki

Webcomics 

AppleGeeks
BackStage (Rating M)
CtrlAltDel-online  
The Joy of Tech
MegaTokyo.com
SinFest.net (Rating: M)
Turnsignals On a Land Raider
VGCats.com

Bands I listen to (all sites more or less rated OT(17+) )

Arch Enemy
Cradle of Filth
DeathStars
Dimmu Borgir
FinnTroll
Hammerfall
Iced Earth
Iron Maiden
Nightwish
Rammstein (translations)
Sabaton
Therion