Interesting discussion on GUIs and the UNIX way. A thought: it strikes me that the way KDE does interapplication communication through KParts is much closer to `the UNIX way' (ie. the ideals of the UNIX philosophy): it is pretty much signals and sockets. The cost of doing things this way is that you are no longer in the CORBA model.
I think the CORBA model isn't compatible with the UNIX philosophy, but then so is much of the standard UNIX runtime (eg. emacs, X). The question, though, is why does CORBA matter so much? Perhaps adherence to CORBA flows from a misplaced loyalty to a bad standard?