The Berlin Philharmonic's Cello Challenge (Der Blitzkriegcello) got a fair amount of mention when it debuted, all of which I managed to miss. (See posts here and here.) For the rest of you who also missed it, the challenge is sort of like Guitar Hero, but with a cellist, a mouse, and Saint-Saëns. You win points by keeping the mouse in time with the cellist's bow strokes. It's funnish, and the fact that my score of 3597 landed me in in the mid-14,000s of those who've played it shows that it's been fairly popular.
Two objections crop up to the game: 1) That it isn't educational, and 2) That it isn't enough like Guitar Hero.
To 1), I say, "So?" Orchestras can't teach all the time. To 2) I say, "Go play Guitar Hero."