I'm actually in the middle of implementing a Scheme variant at the moment, so it's interesting to read about the features/decisions involved in another implementation.

Scheme really is a beautiful language! I just ordered copies of SICP and 'The Little Schemer', I'm looking forward to reading them!

Are there any Schemers on HN who would care to recommend other 'required reads' for a new Scheme developer?

Essentials of Programming Languages (EOPL) http://www.amazon.com/Essentials-Programming-Languages-Danie...

and

The Seasoned Schemer as well http://www.amazon.com/Seasoned-Schemer-Daniel-P-Friedman/dp/...

"Any software problem can be solved by adding another layer of indirection." -Steven M. Bellovin