Emails, Facebook, Earning online (although I'm still new), chatting with friends, watching videos, reading, plurking, and any good and interesting stuffs.
I love the ability to conduct and attend webinars where you get to interact with people from all corners of the world. It's an amazing collaboration tool that can accomplish so much, and live video feeds are also very useful in many circumstances (you can broadcast from places like justin.tv and ustream.)
one thing i love about internet aside from the powerful social online network like facebook is that i earn from it. c: