I wish I was back in high school for this one: Wireless Networking for the TI graphing calculators. Back in high school, our graphing calculators full of games saved some of our sanity. We went so far as to create Tetris tournaments. I went so far as to create games in BASIC for the TI-85, then to learn assembly for the TI-92. I never did get enough knowledge of the TI-92 to create games, but that knowledge did help me out with my college course in assembly.