I used the TI-83 at school. However after a few years the batteries died. As changing batteries is waaaay to technical for me, I just downloaded the TI-83 app for my android. I love it, and use it quite frequently too. (it's called Andy-83, for those interested. It seems rather complete too. =D)

Coincidentally i created my first Android app yesterday. It was, of course, a 'Hello World'-app. I tested it on an emulator running froyo, and it did what one would expect from a hello world app. Of course i wanted to show this amazing feat of technology to my collegues next morning, so i packaged it and installed it on my own Samsung galaxy S, running Froyo. As I already feared the app had gotten an extra feature on my phone. Causing a 'Force Close' right away when you run it. So no, in my little bit of experience, it seems the emulator isn't good enough as only testing device. (And yes, I'm enormously proud of being the first person ever to make a Hello World-app fail! =D

Running windows 7 at home, and vista at the office, both with the nice classic win2k look. (both computers are easily capable of running aero)