theta - because when i learnt maths, theta could be anything. who wants to know pi anyway, its just a big show off number, completely irrational, and serves no other point than to work out the circumference of a circle...
Neither, I use AOL Instant Messaging. But if I HAD to pick one, I guess I would go with Windows Live Messenger because Hotmail automatically signs me onto it whenever I go to check my email.