I peeked at a promising sounding delegation based lisp package mentioned in the comp.lang.lisp FAQ:
ftp.cs.cmu.edu: /user/ai/lang/lisp/oop/non-clos/corbit
but unfortunately it doesn't seem a good fit to Muq.
For an infix notation, ftp.cwi.nl:pub/python is an infix language competing with Perl and Tcl, offering good object-oriented support with multiple inheritance and such, used and recommended by Randy Pausch in his impresive "Alice" immersive-VR system.
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