Right now this is a very minimal bundle of functionality. Basically it’s my create/add-buncha-files/compile script, and not much else. It’ll work on Mac OS X and any Unix. Windows is, on the other hand, special. I don’t have a Windows box, so I don’t know.
On the ruby-epub Google Code page is a featured download (ruby-epub-0.0.1.gem) and a featured wiki page (“Installing”), and also the road map (more a check list) prominently displayed.