...you could also google for "best perl modules"...which is a question that has been asked many times before.... search groups.google.com too

.... you will get your answers

...the problem with classifying modules as useful is that until they are widely tested by everyone, you don't know if a module is buggy or not, and you rely solely on the glorious self-accolades of the module authors :-)

...so you really want to find the best-written, and best-working modules....which you can only get by polling existing users....that is why perlmonks is so useful..... you quickly get the feel for the quality of various modules, by the chatter you see about them here