I know this is an old thread, but I was wondering Shaderhacker -- have you put up any of the code / demonstration stuff for this render viewer?
I'm currently the TD at a place in Toronto, and we've inherited a lot of tools that were written in a combination of MEL, Maya Python, and Visual Basic. None of them work properly, and I'm looking at wxPython as a way to sidestep a lot of the hassle of getting some nicer tools up and running; the main thing right now is seeing how people do communication with Maya. It might end up that I have to write a custom UI for the pipeline tool we're looking at, as well as replacements for the tools mentioned above, but I'd like to do from within Maya if possible instead of using less-dependable commandPort trickery.
Anyway, if this project is still going for you, or if you have some good links on getting wxPython running in Maya 2008 on Mac or PC, that would be stellar.