A few weeks ago I wrote a patch that adds reverse dependencies to hackage [1]. I have know hosted a small test hackage which demonstrates this feature. It can be found here: http://bifunctor.homelinux.net/~roel/hackage Browse to your favorite packages and find out how much other packages depend on them! I also noticed that work is underway to implement a new hackage-server [2] based on happstack. If people find this feature useful I could also write a patch against the hackage-server code base [3]. Regards, Roel van Dijk [1] - http://hackage.haskell.org/trac/hackage/ticket/576 [2] - http://sparky.haskell.org:8080/ [3] - http://code.haskell.org/hackage-server/