The Dink Network

Well, I've been having some fun with my computer setup, and I've got a multi-screen thing going on. The problem is, in fullscreen applications, (Ie, games) I can't figure out a way to limit the cursor within a single monitor. At least, not without disabling the other monitor, which I don't want to do, as it's a bit of a pain to reorder the icons on that desktop. Is there any sort of small application that will allow me to screenlock to a specific monitor? (via hotkey preferably). Sofar google has failed me, and usenet replies are going to take a long time.

Any help anyone?