I'm surprised no one has mentioned it so far, but Simon Cozen wrote an awesome tutorial on Perl Internals available
here. Soon
his book
on the subject will be out, and I'm sure that will be even better.
In the meantime, do as much XS (and Inline::C) hacking as you can manage. Almost everything you learn about XS will be useful in the Perl core and the documentation is generally much better.
-sam
PS: See, I can pimp other peoples' books too!
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