This is an excellent list of top five things that every Perl programmer should be aware of. A great article with good tips.
From the article:
Inside every tangle of obfuscated Perl code is a clean, well-architected gem struggling to emerge from its cocoon. brian d foy has spent a lot of time thinking about this for his new book, Mastering Perl, and has come up with a Top Five list of things that every Perl programmer should be thinking about when writing code.
Five Ways to Improve Your Perl Programming [onlamp.com]