Some entry-level video mixing software: www.neuromixer.com. Like most of this software, though, precise editing (to points within clips) and region definition in real time is difficult to impossible due to poor cueing tools.
On the mac side and on the higher end, Modul8 (www.garagecube.com) and vdmx (www.vidvox.net) pretty much own the field, unless you are into building your own, in which case look at Isadora (www.troikatronix.com) and Max/Msp/Jitter (www.cycling74.com). There is also an open source system but I'm blanking on the name right now. Brook -- _______________________________________________________ Brook Hinton film/video/audio art www.brookhinton.com studio vlog/blog: www.brookhinton.com/temporalab [Non-text portions of this message have been removed]