CUIduino
Just found this:
Arduino Board with true USB support and built-in midi-over-usb support.
I posted this project earlier. Just to stop any confusion, this is not an Arduino project. It is based of a PIC chip. It’s advantage over the out of the box ardunio is that it does indeed have native USB support. I wouldn’t worry about it however, as the newer versions of the Arduino Mega will have a USB port as well. It will feature 2 PWM connections, 36 Digital I/O, and 16 analog inputs. I think this will be the best board to use, once it is released.