Here I present some links which I find useful.
Artists:
http://www.larryelmore.com/
-you probably know him, do you?
http://www.keithparkinson.com/
-him too...
Other (private) role playing related homepages:
http://www.cormyr.de
-german page about AD&D
http://www.plasmazone.de
-german page about all kind of things including rpg and some hard riddles
http://www.math.auth.gr/~bchr/
-huge english page called The Eye Of The Fly
http://www.technoschamane.de
-german page about Shadowrun
Now some things that have nothing to do with rpg.
Mixed:
http://www.setiathome.de
-ever thought about finding alien intelligence?
http://www.frisk.is/f-prot/download/
-free download page for F-Prot a virus scanner
http://www.google.de
-quite a good search engine
Things for my region only:
http://www.marbuch-verlag.de/
-cinema program for Gießen, Wetzlar and Marburg.....
Musik:
http://www.winamp.com
-this is the best mp3 player I know of
http://www.geisswerks.com
-he who writes the most catching visualisation plug-ins for winamp
http://www.fatepoint.de
-a young rock band from germany (actually the keyboarder is my DM...)