Ok, I'll send you the source with a Ruby test file when I get it cleaned up.
I'll also add a README and perhaps a batch file or two for building/running it in Windows. (Building/running it in Linux should be even easier, but I doubt I'll have time to test it.) I'll also see what I can do about documenting the source code for the extension in case you ever need to maintain it, as well as the minor changes I've made to make it more Ruby-like. I can't promise documentation as nice as yours, but I'll try to come up with something. ;-)
It is entirely up to you, but I would recommend that you add a pre-built Ruby binary download for the Windows crowd. It requires a special build of Ruby, but only until the default Windows installer for Ruby upgrades to Visual Studio 2005 (they're still using Visual Studio 6.0, and the libraries don't play nicely together). It should be very easy for you to build, but most Windows Ruby programmers won't have Visual Studio installed.