Try out the new game Snail Mail from Sandlot Games. My friend Andy worked on this game, and I *almost* got my act together and did the voices for the enemies. Next time I will record the voices the night he asks for them rather than a week later.
Ummm ... I think the only games that can be registered are Double Dash, 1080, Mario Party 5, and Mario and Luigi (GBA); HOWEVER, you can also register your GCN and GBA systems (the GBA and GBA SP can be registered as separate systems, yay!)