I am a high school mathematics ed major. I'll be interning everyday starting in January up until the end of April/beginning of May. How many teachers (not necessarily math), are using tablet PC's? I've used mine in the school twice so far. I've come across a problem. One day it worked fine and the pen and everything was displayed through a data projector. The next time I tried it, the pen wouldn't work. I'm using a vga cord to link the data projector and my tablet PC. If I can resolve this issue, I have all my lessons set up through powerpoint and I can easily use my pen to jot down notes during lecutures. The students find this interesting. Any tips would be appreciated.