I asked something similar a while ago and got a few good links in response. Look at the responses to LWP and form bombardment,
Also try a perlmonks site search (top left) for Parallel and also LWP, some good links come up.

In reply to Re: LWP::Parallel Doesn't Work For Me by agoth
in thread LWP::Parallel Doesn't Work For Me by nikos

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