I am wondering about using a Mac for school (12" PB or MB or something like that) and I'm having troubles finding some good software. I need good note taking software I can create diagrams in, and a nice calculator program that emulates a TI-8x as well as possible. Any other things that could help a student would be nice. So far all I can come up with is Circus Ponies Notebook, but I'm not sure if there's a diagram creation feature. Any help?