[Haskell-cafe] Complex Event Processing in Haskell

I'm looking for examples of production-capable Complex Event Processing systems in Haskell along the lines of Esper: http://esper.codehaus.org/ I know of Nettle (and McNettle and Procera) from Yale, and it claims to have excellent performance. http://haskell.cs.yale.edu/nettle/ Is there anything else? Is there anything in another functional language I should look at? I know FRP systems in general deal with processing events, but I am looking specifically for things similar to Esper. Tom