I'm building a simple program. Basically some simple meshes, some cubes, etc. I'll be having them crash around a bit through (against some solid objects). I've worked with a couple of rendering engines but nothing like what I want (i.e. like, with physics :] ).
Give this a try http://sourceforge.net/projects/vbphysxdx9/
It uses PhysX by Nvidia. You will need a Nvidia graphics card with PhysX to use it though.