I've been looking for a way to do this for some time now: scrolling unfocused windows, in Windows. You can do it with a Mac (movie here) and on Linux. I became accustomed to it after prolonged Ubuntu-use on my laptop. (It's incredibly handy on lower resolutions too.)
So I posted a note (with replies) on Pownce...
So I'm using KatMouse now. Program is working perfectly fine, and was exactly what I had in mind.
Also: I'm beginning to like Pownce (much more than Twitter anyway).