I've been playing around with physics libraries a bit, here's an app I made using Newton
(about 3 meg download - and if you don't have a version of VS C++ 2005 installed you might need to download this
from Microsoft). I haven't tried to distribute a Windows app before, so it'd be awesome if anyone could download it and make sure it works on their computer (it worked for a couple people on #gamedev so hopefully no one will have a problem with it).
And here's a screenie
It needs a bit of work, i'm not calculating collision with the camera so you can walk through the balls and walls, and there are a number of things I could do to speed it up a bit, but I'm pretty happy with how easy it was to get started.