Other than work stuff, and torrents, I mostly (not in order):
- surf for pr0n
- watch/trade stocks (scottrade, finance.google.com, finance.yahoo.com)
- lurk on forums
- lurk on IRC
- play CS:Source
- watch streaming movies from Netflix
- chat with people on msn/icq/aim
- lurk on facebook
- surf deals sites like bensbargains.net and fatwallet.com
- read news off google
- check daily to see if sexylosers.com has updated