I'm working on a script for one or more monitors that will wrap the mouse around the monitors and yet still allow you to drag windows to the edge of the monitor for the Windows 7 Snap feature.
So, this is a basic script that does what I set out to do. I think it will even work on multiple monitors.
If you have more than two monitors and want to test then I will love you forever.
[update -- 05/19/2013] This update has a major difference. When the user drags the mouse to the edge of a monitor there is a 300 millisecond delay before the mouse will wrap. This will give the user some time