[Zope] pythonScript huh?

I'm confused. I've used PythonMethods and ExternalMethods, but how do I use PythonScripts? There doesn't seem to be a pythonScript product on the zope site (if you search for 'pythonscript" you get heaps of stuff though). Is it a 2.3 thing? I think PythonScripts may be just what I want, I'd like closer integration with python but find External methods a bit cumbersome. thanks tom