I'm personally invested in HyperDex (the non-ACID open source portion of the project) using it for a project of my own and have been developing a set of Haskell bindings against the HyperDex client. I may also develop some Warp bindings later, but my project may not need the guarantees provided by Warp.
The Haskell bindings project can be found here: https://github.com/aaronfriel/hyhac