Office work, presentations, acounting
Statistics/plotting/research/signal processing with matlab
Internet, IM, email
Creating professional reports, write-ups and journal articles (Kile and Latex)
Graphics: Various diagram editors, gimp, other photo suites.
Photo editing
Professional robotics simulation
programming and development (eclipse, KDevelop)
Watching movies, listening to music
Indeed my entire PhD is only possible becuas eof linux really.
Basic gaming (I have a Wii for serious stuff)
What do I use windows for?
Used ot for gaming but not anymore. Its useable for multimedia stuff, but has no advantages so no need to boot into windows and put up with hours of upgrades just to play some music.
I use Adobe illustrator someitmes in windows.