* Physics simulation for all objects, thanks to Chipmunk (see screenshot #1 below)
* Units can now shoot, but turns don't change yet (screenshot #2)
* Input mapping is done in a really nice, general and configurable way, though still needs more work, but that will be for later (this took quite a while to write)
* Lots and lots of structuring and cleanup of code
Read the rest at my new blog.