A program has been pointed out to me recently that you beta **** may want to check into pronto. Anyone else into creating demos or movies from the games you play aswell.
http://www.fraps.com/
Fraps will record an uncompressed AVI of anything on your screen. This means any game. I did this in T2 and with a T2 demo recently and the results and ease of use are incredible. Though i skipped the whole sound thing. I then used a program called VirtualDub. This progam compesses and has the capability to encode sound to your AVI and output it to DivX along with other formats.
The site states that the hit on your proc is minimal. That is assuming you got a d0pe c0mputer. Not like my own "barely-meets-PS-sys-rec" PC. One other issue is that you must view/play at a resolution of 640x480, with bit rate varying depending on your system specs.
So to all you beta testers that wanna make us some demos. Fuck you and have fun.