Facebook: So I signed up to this last year purely to play Tetris. I won at that so I started looking around at what else facebook had to offer... found a bunch of friends I hadn't seen since highschool... yeah... everyone should start playing tetris :p

Twitter: Fortunately for me, Michael was bombarded with SMSs as I was decided whether or not to use the service. I think I made the right choice. I do enjoy spamming others though.

last.fm: Great concept and you find similar artists and songs very quickly... too bad you rarely get to listen to the songs you actually want. I'm not too into mainstream music so it's easier to bring in my own music.

Google Calendar: Don't use this often enough to find it useful.

Yahoo Pipes: As above. I often forget that pipes exists... that doesn't really help I guess.

eBlogger: ... only because I have to.

del.icio.us: As above.

flickr: I'll probably random add photos here if people don't have a facebook account. Remember, Captain Planet will always be there for you.