This was a cool little project that I set up. I used the camera connection set to USB, with a USB midi cable for your computer, and VOILA! It worked nicely. I was able to control my Akai MPC 1000 via MIDI! I used the MIDI out and plugged it into the AKAI MPC 1000 MIDI in. Now, the pads were not as supple as the 1000, but it was nice to have it work. I imagine there are many other amazing tricks you can do with this setup. With the right software on the iPad, I aimagine anything is possible.
Next, I would like to see if I can use the 1000 to control General Midi on the iPad!