Here's a simple little program I whipped up to use the Rock Bad drums as a MIDI controller. I'll have a video up sometime later. NOTE - You'll need the .NET 2.0 Framework.
Note: I'm not providing any support for this program. It's up for those who want a MIDI solution.
EDIT: Since it appears my program is complete crap, I now redirect you to somebody who's developed a much better piece of software (and probably spent much longer than fifteen minutes developing it). Enjoy!