For me it would probably be:
- Work
- Homework / Research
- Email
- IM
- Podcasts and Music
- Forums
- News- Sites such as slashdot and digg to keep me updated on what's hapenning in the tech world
- Gaming
I cannot stay without internet.....i browse various sites, chat, information search, music, games, emailing, banking and what not......Internet is one of the most important requirement of my life..
even i use the net mostly for this purpose. but i also use them to download songs and for various assignments which i get for work. also sometimes for chatting.