Mixen is an iOS app that lets you take your mixes with you, without imposing on you or forcing you to store or organize things in a particular way, or storing your audio anywhere but where you put it. It’s an awesome music player that does all the things music players do - like playlists and tags.
Just some of the features:
Mixen integrates well the audio system in your car, or AirPlay. And Mixen always remembers where you left it - if you were paused in the middle of a song when it was shut down, you’re at that exact spot the next time you open it.
Theriphone is a fun little app that turns your iPhone into a theremin - pitch, volume, vibrato, waveform mix and whether or not playing uses a chromatic or continuous scale can all be mapped to where you’re touching the screen, or to any of the pitch, yaw, roll and compass heading sensors, or acceleration.