Marco blogs about Event Stream Processing (ESP) at http://rulecore.com/espblog/. There is also a Wikipedia article about it.
ESP is especially interesting in the financial markets, where you want to perform real-time decision making on a stream of quotes coming from your market data distribution infrastructure. ESP gives you opportunities for things like algorithmic trading and real-time risk management.
Companies in this space include Gemstone (Gemfire), KX (KDB+), Vhayu, Streambase, Aleri. I would like to see Microsoft get into this space with a future version of SQL Server. (Since I have some meetings coming up with some people from Microsoft, I will be sure to ask this question.)
I will definitely be exploring this space in the near future.
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