Willem Broekema announced CLPython in his news posting <1152045368.275100.86920@b68g2000cwa.googlegroups.com> today.
That's really crazy shit! (Meant in a good way! :-)
A Python implementation in Common Lisp. At the moment it's Allegro only, but in the future we could perhaps compile CLPython with Python to run Python ... (CMUCL's compiler is called Python, too. :-)
Sound's like fun.
By the way: There's a similar approach called Python-on-lisp. This project uses the real Python and builds a bridge to it.