Most of my hobbies

Sports and stuff - Winter sports, Billiards, Match shooting, Chess...

Photography - It was fun as a kid, and it's fun again now with digital photography.

Games (Computer games, roleplaying, MUD)

Astronomy - But I'm not that active

Mythology - Greek, Norse and Modern

Usenet News (I've spent a lot of time on this), IRC (Internet Relay Chat)

Music - I like many kinds of music

Literature - Tolkien, Pratchett, Banks, Stackpole, Cherryh, Vinge, Ibsen, Bringsværd, Johansen, +++

This list is incomplete, but I have so many hobbies I don't know what they are anymore ;)