Somewhere along the line I picked up the Mod_Perl Cookbook. Good read, but now behind the Apache 2 curve.
That book put my finger on one frustration I have with embedded Perl Nagios (ePN). There's no mod_perl-ish perl-status equivalent in ePN. It seems impossible to know basic things like how many and which scripts are loaded and running in ePN, which modules and versions are loaded, etc. I think I'll try to roll my own with Devel::SymDump.