the big 3 i know of are:
Fraps: many player have problems running with lc, other swear by it
GameCam: very good prog from what i hear
zd game recorder: decent program but you either have to choose speed or clarity of video.
all are free to download but you have to pay to be able to record more than 30 sec of footage. if you know what you're doing you can find a registered version on a torrent searcher. hope this helps