Rose::DB recently came into use here. Really nice and does Data Hygiene before it even make a DB connection that would have failed.

Dancer... really neat simple Web Framework. Allows for some really powerful stuff.

Moose and Mouse... nearly self explanatory.

Testing frameworks galore and most of them work well.

abstractions... a (usually) well written module to do about anything you want. (Payment Gateways are a really good example there)

In general, if you can think it... there is usually a CPAN module for it and sometimes 4 different ones to suit you the way you like to use things.