Advanced Python network programming
Understanding Network I/O, Part 2 by George Belotsky (via The Farm) is the best tutorial on the subject of network programming I’ve seen yet. It provides a detailed explanation of simple threaded network clients, thread pools using the Queue module and asynchronous I/O using both Twisted and Python’s asyncore library—then discusses the strengths and weaknesses of each approach.
I’ve also just noticed that O’Reilly provide RSS 1.0 and Atom feeds for each of their authors. Neat.