I know the majority of the folks who read this site are Mac users, so you might be interested to take a look at a project I’ve been contributing some code to here and there. It’s called Scopebox, and it’s a software based Waveform/Vectorscope/Preview monitor (with lots of other stuff) to do live analysis of your video. Mike‘s been working on it for the last six months or so, and it’s finally about ready for release, so take a look.