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I am demonstrating/performing with a newly open sourced DJ + VJ program I wrote, called dvj. It treats video as a first-class citizen, so if the user scratches the audio, the video also scratches in sync. It uses an M-Audio Xponent as a MIDI input device, and also supports a Nintendo Wiimote for video-scratching with the pointer. Runs on Linux, but OSX and Windows ports will be available later this year.
Web site: http://code.google.com/p/dvj/
Video URL: http://interimdescriptor.blogspot.com/2009/02/beat-research-video-posted.html
interim descriptor
I'm with the Bay Area Computer Music group.
http://interimdescriptor.blogspot.com