I just discovered today that a 64 bit version of SONY Vegas is coming out, and from what I read it looks to be impressive. The clip I found talked of a demo showing off not one but four HDV clips running simultaneously in Sony Vegas, in MS_Vista. I use Vegas because I found it runs very smooth in my system (in contrast to Avid and Adobe Premier Pro which choked), including real time playback of HDV with effects, audio, etc. I am quite excited at the prospect of 64 bit Vegas!

Linux, the choice of a GNU generation.
http://subzerolinux.org