[ac]

Replication and sharding (horizontal and vertical scaling) in acid-state are in development right now. The developer's page has the road-map as well as his contact details: http://acid-state.seize.it. There's another project for distributed storage and data processing in Haskell called Holumbus http://holumbus.fh-wedel.de/trac which powers one of the search engines for Hackage API's.