'Bulents screen recorder' can grab ANYTHING from screen including whole movies and webcam shots... its a camgirls nightmare...lol.
Best of all its free. The free version stamps a logo on the bottom right but if you size the capture area right (just drag with a mouse) then you can position it away from the interesting areas and crop it off later. I did vid thumbnails with it from a sponsor whose supplied thumbs had nothing to do with the free movies on their site that they linked to!
http://www.thesilver.net/ is the place to get it.