For those running Windows XP, just throw the clip into MovieMaker and play it. On the bottom right just below where the vid plays, there is a little button that looks like a camera; click that and it'll take a picture of what is in your little movie screen.
This is literally one click capping; just click and say where you want to save the cap (I default mine to the desktop so that I can delete it as soon as I post the vid).
