PyCXX V5.1 rc1 has been released. This version supports Python 1.5.2, 2.0.1, 2.1.1 and 2.2a1.
Release 5.0b is available as a beta test. It contains the changes made by Barry Scott and Geoff Furnish that include a new model for writing Extensions. It is substantially incompatible with version 4 in that area. A core dump on FreeBSD/gcc is known to occur but nobody has had time to look at it. Eyeballs are needed on this project.