Bindings to Chipmunk 5.3.4 with extra features for use with Ruby 1.8.x and 1.9.x. Version 5.4.3.4 released on rubygems. Just a gem install chipmunk should work, even on windows!
Would it be wise to use this in a separate thread in rails(via suckerpunch gem) to mirror the physics of a websocket game where the client is also using chipmunk ?