We two just had a short discussion in CB about classifying CPAN-Modules like http://kobesearch.cpan.org does.

I'd like to point - without further comment - you to this blog about CPANTS

http://szabgab.com/blog/2008/06/1212827982.html

and the resulting heated discussion in the comments.

Furthermore http://cpants.perl.org/ and http://use.perl.org are down ATM.

IMHO if you want to learn from other projects just pick projects you liked and use regularly.

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UPDATE:

Successful coding practices have a lot to do with evolutionary processes which can't be restricted by a fixed "Intelligent design" but only probed and discussed in an ongoing process.

Restrictions conflict with creative Perl culture, e.g. I just solved an otherwise "unsolvable" problem with goto EXPR. A metric parsing my code and eliminating this module because "goto is bad" would transform Perl into a bad Python ersatz.

TIMTOWTDI and "Success is Sexy"!