There are a number of sites where, in my opinion, are nice tricks and Perl idioms are to be found:

• The Perl Cookbook is the oldest compendium of cool tricks and good Perl programming
• Mark-Jason Dominus has lots of interesting bits and pieces of code and good advice
• Perl.com occasionally has interesting articles with tricks
• Articles from The Perl Journal, and its book collection (Computer Science and Perl Programming, Web, Graphics and Perl/Tk and Games, Diversions & Perl Culture)
• There is a lot to be learned from other Perl Monks

I'm sure there are other people who have found interesting Perl bits elsewhere.

Think about the problem you're facing and maybe you'll come up with a cool, handy, timesaving trick yourself!

Arjen