I'm in SUB, right now. This is what I've been doing for the past hour:

- stream other people's music collections through iTunes. Now whether they're notified that I'm listening in, I'm not sure.
- download large files without having to sit through low download rates and capped bandwidth at home (e.g. linux distros).
- there are many fragmented networks, so you can't just walk across campus (well, at least I didn't try). The library has their own system, the Faculty of Education has their own, SUB has their own.
- the SUB is filled with people toting their notebook computers to chat with their friends online and work on essays (or play games).