I used CaptureWebCam and it worked for me. It's not free, but they should have a trial version.
If you using MSN Messenger video chat and you'd like to record the other party's video, it was a while ago, but I've followed these instructions and they worked for me...
I haven't tried it, but I've read about BlogTV - I wonder if it can also be used for recording and later replaying webcam...