Wow! Unfortunately more expensive than Macintosh Common Lisp (which I already find too expensive), but still impressive. Unfortunately, it's not revealed whether CLIM is part of OS X Common Lisp. OS X is getting more and more interesting programming environments. But for now I'm still waiting for the OS X Native GUI Smalltalk, that would be the hammer for me.
I find Allegro Common Lisp for OS X uninteresting, by the way - no GUI and a price that represents a real outrage.
At lemonodor there's the original article.