Mara: Links

Linux, Unix and Free Software/Open Source

LinuxQuestions.org — Probably the biggest Linux help site and forum. More than 200K users.
Sourceforge — Open Source software repository.
UNIX history — a big graph showing Unix system history from 1969 till now.

Programming resources

QtCentre — New forum about Qt library and programming in general.

News

7thguard —Free Software/Open Source news (in Polish).
Slashdot — News site. Often very hot discussions (or simply flamewars).

World building

Fantasy Worldbuilding Questions — Huge set of questions about the world you're building. From climate to fashion.
A Way With Worlds — A collection of papers.

The real world

Edge: The world question center — Non-trivial questions and answers to them.

Entertaiment

Hattrick — Online football (soccer) manager.
My Hattrick team page at ht-arena.
Ogame — Online space strategy. Buggy and easy, but still fun.