Hello, I have implemented reverse dependencies in Hackage. You can play with the demo here: http://bifunctor.homelinux.net/~roel/hackage I already send a message to Haskell-Cafe, but I made a few changes and would like some feedback. You can sort the tables of reverse dependencies by clicking on the column headers. Large tables (base or the total overview) might take some time. Sorting is done client-side with a bit of JavaScript. I added a link to an overview of the reverse dependencies of every package in hackage. It is sorted by the total number of rev. deps by default, so the most dependent-on packages (within hackage) are at the top. In the future such a list might be expanded with other information, like the download count. Things I would like feedback on: - Rev. deps overview for all packages; is it useful? - If you look at the reverse dependencies for a package like digest you'll see a list of packages that depend on digest. Next to the names of the packages that depend on digest are their respective reverse dependencies. The idea is that you can see which are the most "important" (for some value of important) packages that depend on digest. Is that useful? - Is this the best way to present the information? Currently I am working on a patch for the new hackage-server. Regards, Roel