Checking emails, watching youtube videos, using Gimp for drawing stuff, playing some games (mostly Pokemon), browsing the internet, forum stuff, sometimes skype+msn, devART.
Also sometimes I boot my Linuxsystem for updates.
On the internet, I watch Youtube videos, check my email, talk to some people on Facebook/Skype/MSN, read xkcd and SMBC and then I go read gaming news or general news. I also read mathematics and computer-related articles quite often.
Off the internet, I code (badly), play a significant amount of games, listen to music, watch some series or movies...
Most stuff I do is indeed on the internet, I suppose.