I have seen postings about work on message-passing IPCs for Haskell. I like STM but want to keep an open mind ... I can't find those postings. Can something remind of this work and where/how I can read about?

I made a quick hack composing BSD sockets from Network.Socket for higher level IPC. It was for a one use deal, but you're free to use and improve on the library - called 'ipc' on hackage. Tom Hackage: http://hackage.haskell.org/cgi-bin/hackage-scripts/package/ipc Basic homepage: http://www.haskell.org/haskellwiki/IPC