I received an email today from Stani Michiels, the author of SPE. He asked whether I would like to collaborate in the port of the editor to Mac OS X. Sure! I'm delighted to help.
From the list of features and screenshots SPE looks like a useful environment for Python development. Since I like to use one IDE for everything (was GNU Emacs, now Eclipse) my choice nowadays is PyDev, which is getting better and better, but more Python editors are needed on the Mac for people to choose, so I am glad to help. In addition I will learn.
I did today a few basic tests he asked for, and sent a handful of screenshots. By now everything seems to work fine with the last version of wxPython except for the tool bar, which doesn't show up.