Glad it interests you. I really ought to spend more time learning common lisp myself.

I guess I'll release it under the same license terms as perl itself (GPL/Artistic).

It does include a top level REPL - just download, unpack the tarball and type perl rep.scm.pl. I've been using that a lot myself. I run it from within emacs in an inferior scheme buffer so that I can edit lisp function defs and forms and evaluate them straight away. It's a great way to develop code interactively. I wish I could do it like that for perl.