I got myself a Nintendo DS learning program from Ubisoft for learning Mandarin Chinese. Seems okay, but I guess I'll need a native speaker to listen to what I have to say, since I can't tell whether or not I'm saying things correctly. I'm also going to get Learning Japanese once it comes out. It's good mostly for building your vocabulary, which I'm keen on doing.
Funny thing. Nintendo is supposed to be a game company, but I'm using Nintendo DS as portable classroom for learning on the go. Konami also has a game out called "Let's Yoga", based on Wii Fit module. I'm going to get that one also. Now, if they have one for Tai Chi, I'd be real interested in that, especially if they have different versions (Chen, Yang, Wu, International) and weapons (stick, sabre, sword, spear). Hint, Konami! Please make one for me!