At the last New York .Net Meetup, Luke Hoban presented an overview of F#. Like everyone else who's catching the F# bug I was quite impressed with its succinctness, sequences, forward pipes, and support for asynchronous programming (called workflows).
Could a reasonable amount of F# code replace the big expensive CEP engines we use?
So I asked how to compute over a stream of data, using standard deviation is a simple example. Luke has a great write up on this topic.