Not a reply, since I just subscribed to this list.
I have looked at stackage. AFAIU it is basically a place to host a subset of Hackage (plus the possibility to patch packages). If I've understood that correctly it means stackage is of VERY limited use to us in maintain Arch Haskell.
As far as I understand it their big advantage is that each version is completely coherent, a snapshot of packages that work together. They pipe it through Jenkins and send mails to each package maintainer of packages that don’t build. So they automated the process and accept new packages. Maybe this can be used? e.g. basing Archhaskell on it and just manage the remaining packages manually while slowly integrating them into Stackage? -- Proudly written in Mutt with Vim on Archlinux. Q: Why is this email five sentences or less? A: http://five.sentenc.es