Woop! Bruce ran into the PP module after the flareup over the GIL yesterday - he seems to like it. I'm writing a few things up on all of this (and providing demos) and PP is one of the modules that due to it's simplicity and ease-of-use I am focusing on.
Parallel Python: "My previous post led me to this library, which appears to solve the coarse-grained parallelism problem quite elegantly."
Update to add: A "quick benchmark" has also been posted (via reddit)