ahhlun,
I wrote Re: Refactoring a large script which has bits and pieces on writing good code as well as writing code effectively. Each one of those things can be expanded further. In my opinion the best way to write better code is to learn from others more talented than you who are willing to teach. The Monastery is a perfect place to do that (which is what I did).

You may also be interested in "Modern Perl" which is the idea that we should be taking advantage of all the advances and lessons programming has made over the last few decades and standardize more on how we program. There are differing philosophies but googling around should get you started.