surely, the scope of this task is not to be underestimated. to create and maintain a document describing each of the ever-changing and growing list of the thousands of modules, bundles, and scripts on the CPAN would take a great deal of patience, dedication, reason, and time. i don't believe the benefits of this task outweigh the amount of effort required to accomplish it.
however, if the gods see fit to add such a compendium to the resources already available at our inimitable monastery, i would like to suggest an entry for one of my favourite modules:
DBI: mostly harmless.