Resolume (Free)
http://www.resolume.com/http://www.resolume.com/forum/index.phpResolume is an instrument for live video performances. Completely built to quickly improvise your videos to the music. Play up to three layers of video, with up to six effects. Play video forward, backward, adjust the speed or scratch it by hand. You can freely improvise without ever stopping the video. Resolume is the preferred software of choice for many professional VJ's and video artist in 40 countries worldwide.
Motion Dive - Tokyo ($299)
http://www.roland.com/products/en/_support/dld.cfm?ln=en&dsp=0&iCncd=871Audio and visuals, the collaboration between these two elements creates an overwhelming artistic experience for musicians and the audience. The innovative world-famous VJ software (Win/Mac), “motion dive .tokyo” by Digitalstage, and EDIROL/Roland join forces to offer an intuitive and powerful package for artists. This package (Model Code: MD-P1-S) includes the motion dive software and a sleek console unit for intense live performance. Achieve complete music integration by connecting EDIROL/Roland V-LINK compatible instruments.
Union($299)
http://www.lividinstruments.com/software_union.phpUnion transforms your computer into an all-in-one live VJ software mixing studio with hundreds of effects, live video inputs, and complete MIDI integration just to name a few features. It's simply the easiest way to scratch, mix, control, create, perform, and record cutting edge visuals in real-time. Forget about expensive hardware rigs and confusing equipment - let Union expand the possibilities of your creativity.
More here:
http://www.audiovisualizers.com/toolshak/vjprgpix/softmain.htm