For those of you who are trying to pull off collisions between 2D convex polygons accurately at any convex shape or angle, then have I got something for you. I tried to make it as simple as possible, so figuring it out or converting to another language, or graphics library like DX/OpenGL, shouldn't be a problem.
It simply uses the Separation Axes Theorem, although most of code came from Chapter 1 of this rigid body 2D physics tutorial (which is in C++):
http://uk.geocities.com/olivier_rebellion/Polycolly.zip
It was a pain, but I converted the code into pure VB to make it easy on everyone. Enjoy the code. I too plan to write a massive rigid body physics tutorial (2D and 3D), so keep a lookout.
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Here's another one I uploaded, only this time, the polygons cannot pass through each other thanks to collision response. I modified some of the other functions and added a couple new ones to allow this response to happen.
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