perlguts, perlxs, and perlxstut manpages
A series of articles at PerlMonth.com by Steven McDougall:
Chapters 18-20 in Advanced Perl Programming, by Sriram Srinivasan (O'Reilly)
Extending and Embedding Perl, by Tim Jenness and Simon Cozens (Manning Publications Company)
The perl-xs mailing list on http://www.perl.org/ (email email@example.com)
Chapter 9 ("Tuning Apache and mod_perl") in mod_perl Developer's Cookbook, by Geoffrey Young, Paul Lindner, and Randy Kobes (Sams Publishing).
Mastering Regular Expressions: Powerful Techniques for Perl and Other Tools, Second Edition, by Jeffrey E. F. Friedl (O'Reilly)
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Other projects to check out: meta-religion.com is for those interested in Religious, Spiritual and Esoteric Phenomena. i-want-a-better.com is a community of people discussing what they would like to be improved in their lives and things they use and interact with. You may also want to find a healer in your area or read articles on variety of topics.