Actually, I was more thinking about a separate tool. Something you'd just install, from cabal/apt/pacman/whatever, using some external system tools to check out dependencies of the application, then packaging everything and putting some install.sh script around for linux, and a nice installer under Windows, etc. It is just an idea, but the main point here is that it'd just be "simple". (of course, the idea I describe may fail heavily for packaging very complex and heavy apps, IMO, but I think there are workarounds)

PS : shouldn't we move this discussion to -cafe ?