Isn't that what http://search.cpan.org is for ?

Personally, I'm no great fan of Patterns as coined by the Gang of Four, as most of them are either trivial in Perl or useless in Perl, and few of them lend themselves to hiding in a module. The Singleton pattern may be such a pattern, but I feel it's the same amount of code to inherit from a Singleton base class as it is to write the code yourself...

Also, I don't see the need to create a different section for every subdirection of a topic - the Tutorials can have new subsections added though and thus, if you prod footpad long enough, such a section might spring into existence.