I've been working this past month on a kind of music-memory game called Beat Detective and I have a functional version ready. I'd really like to get some feedback so here's the testflight signup page
http://tflig.ht/1bsh5tSThe basic idea is
1)Pick a song from your iPhone/iPod music library
2)The program calculates the actual tempo of the song (but doesn't show it to you yet)
3)Play the song in your head and start tapping to what you think the tempo of the song is
4)Once you've reached a steady tempo you can then see the actual tempo and see how close you were.
5)Vew other peoples tapped-out tempos for the song you picked, or tap it out again while listening to the song
Here are some screenshots. I've also put up a minute-long video that hopefully gets the basic idea across
http://www.youtube.com/watch?v=fjDyLr6PeYk.

The look is fairly sparse. I've tried to use the cool effect from iTunes where the color scheme changes based on the album artwork.
Edit: Added a gif
