Agreed with most of this list.
I don't think perl's threading is all that interesting (except when interfacing with threaded C/C++ code).
Multi-process (forking/IPC) code is more useful just because it's more general (and also easier to translate into multi-machine/networked code), and because of that I'd recommend POE as a good framework to lean since it really makes IPC, networking and event programming a lot easier.
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