The question What parallel programming model do you recommend today to take advantage of the manycore processors of tomorrow? has already been asked. I gave the following answer there too.
Kamaelia is a python framework for building applications with lots of communicating processes.
Kamaelia - Concurrency made useful, fun
In Kamaelia you build systems from simple components that talk to each other. This speeds development, massively aids maintenance and also means you build naturally concurrent software. It's intended to be accessible by any developer, including novices. It also makes it fun :)
What sort of systems? Network servers, clients, desktop applications, pygame based games, transcode systems and pipelines, digital TV systems, spam eradicators, teaching tools, and a fair amount more :)
Here's a video from Pycon 2009. It starts by comparing Kamaelia to Twisted and Parallel Python and then gives a hands on demonstration of Kamaelia.
Easy Concurrency with Kamaelia - Part 1 (59:08)
Easy Concurrency with Kamaelia - Part 2 (18:15)
