The latest PyPRP2 release is Beta 1
PyPRP2 requres Blender 2.57. It will not work in older versions of Blender 2.5, so don't even ask.
A PyPRP2 introduction video is available to help you get started using PyPRP2 and Blender 2.5, narrated by yours truly.
PyPRP2 is still in development, and is missing some features you might have used in PyPRP 1. Let us know what you need so we can prioritize!
more FAQs will be added as they come up.