Mike is right. I actually put my dinky Canon to work on sets too. It comes in handy for shooting BTS footage, and for getting different effects than are produced by my expensive cameras (think Blair Witch project).
It also useful when shooting public nudity scenes, since it is a lot less conspicuous than a large camera with a shotgun mic attached.
I'm going to be investing in a few HD cameras soon, and when I do, I plan to also buy a cheaper HD camera as well to use for capturing to my scratch disk - unless of course Stinky wants to buy me one; I'll even quit calling him a liar and a cheat if he does.
ADG