This looks promising. IronScheme is available in RC form at CodePlex.  Nicely, it’s under the MS-PL.  There is an MIT Creative Commons-licensed HTML version of the Structure and Interpretation of Computer Programs textbook for Scheme at The Scheme Programming Language (4th Edition) is also online.

Hat tip: InfoQ: IronScheme Nears Final Release

I haven’t tried it out, but I’m interested in looking at it.

Oh, if you’re interested in Scheme, you can look at the article on Wikipedia, or the tutorial on WikiBooks.