PET is a collection of scripts that gather information about your (or your group's) packages. It allows you to see in a bird's eye view the health of hundreds of packages, instantly realizing where work is needed.
The code is at http://anonscm.debian.org/gitweb/?p=pet/pet3.git;a=summary, database dumps can be found at http://pet.43-1.org/~pet/db/.
Discussions go on the pet-devel mailing list.
Hackers hang on #pet-devel IRC channel (OFTC)
Here's a (non-inclusive) list of groups that use PET