vs. erlang, clojure?

hi,

seems like the Control.Concurrent stuff could be used to build either
Actors (a la Erlang, Scala) or Agents (a la Clojure). any thoughts on
how one might do those?

re: Erlang, it seems straight-forward: forkIO off a function that self-
calls and/or uses State monad, and that communicates over some Chan.

re: Clojure, i'm not so sure since e.g. getting the value of a Clojure
Ref or Agent isn't async iiuc, and leverages STM. and i don't yet grok
Haskell's STM stuff.
clojure ref ?= haskell MVar/TVar?
clojure agent ?= haskell ??
http://clojure.org/state

thanks.