Lori and Dan blogged previously about students playing games in class on their TI-83 calculators. I'm proud to report that last week one of my students was designing a game in class. Turns out he was writing a role playing game. The TI-83 is quite a powerful tool (there's even software to turn one into a PDA!). With a cable and Graph-Link software you can do the typing on your computer. I offered to let him use a cable in the lab so he wouldn't need class time for typing. Check out some of the software available from Texas Instruments. This would be a great platform for distributing educational games for science and math in particular. My math and physics students are required to have one.