well since nobody mentioned these, and I really use them often, i gotta

Devel::Trace

Devel::TraceMethods (which I reinvented once)

Net::Dict

XML::TokeParser - oh how I love this one ;)

Parallel::ForkManager - i no want to think about forking semantics (i don't need IPC)

and last but not least, japhys YAPE dists.

update: right, well with less than a month of usage, I felt they qualified.
 

Look ma', I'm on CPAN.

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** The Third rule of perl club is a statement of fact: pod is sexy.