You can now get SuperCollider on your iPhone / iPod Touch. I have an iPod and so last week iProdded RedFrik to install it for me, and now a new software project has begun, the Tiny Music System. So far there is just a drum synth / sequencer, demonstrated in this little video I just made.
The CPU load % of real time synthesis on this first generation device (running at 412 mhz) is about 10 times that of my laptop (2 ghz) which is about what you'd expect. It's a sort of miracle that it exists at all, and one I intend to exploit.
[UPDATE] Part 2