Cool sites
Mozilla links
Links collection, maintained by Beonex, for getting more out of Beonex Communicator and solving problems with it
Project Gutenberg
Books in the public domain (mostly old books), digitalized by volunteers.
Also Project Gutenberg - DE.

Online magazines

heise Newsticker (in German)
News about computers, the IT industry and political issues around it, e.g. privacy, free speech and user rights.
Telepolis
Part of Heise. Online magazine about policital issues around the net, focusing on privacy and free speech. Politically slightly left-wing, yet often to the point. Investigative. The German version is more extensive.
Slashdot
Discussion site about Open-Source and net politics. Consider everything said there as opinion (even if claimed to be facts). The links posted there are very valueable, though.
Salon