I've stopped hacking on my Arduino/Gameduino satellite tracker for now. Here's the final video demonstrating it running:
I'm currently working on the final schematic which will be posted on this permanent page. The code will be available github.com, for right now, it includes the library that I wrote that does the satellite prediction. I'll be updating the code sometime later this week.
If you take it and use it, let me know: it will motivate me to do more with the code.