Phillip J. Eby once again proves that every programming language that wants to amount to something is destined to eventually become Common Lisp
I like what he's doing - Python's object system is rather primitive, and generic functions and method combinations in CLOS style are very practical tools for programming. His extended object adaptation in PyProtocols was already interesting, but the quite complete object model based on CLOS is definitely appealing.
I would really wish that Guido van Rossum would give more thought to how he integrates PJE's work into Python than to how he introduces optional static data types.