From the linked article, it emerges in passing that someone is working on a McCLIM backend for OpenMCL. Namely, building on Cocoa. That would really be amazing - a CLIM-based interface. Ok, that would be just a listener and some toy code for now, but in the long run perhaps the kind of tools you know from the old Lisp machines. At least something like that would be conceivable at all.
Besides, CLIM is a pretty cool GUI library with features that would make all the Java bells and whistles green with envy - even if CLIM is many years older
At Planet Lisp you'll find the original article.