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Almost none of the current generation of large scale web applications including twitter are doing anything remotely new.

The investment banking world has as you say had to deal with huge feeds as well as mashups from multiple sources.

http://www.zeromq.org/ for example is coming out of the financial world and looks like it's going to be the nginx of amqp systems. It looks like it's way faster and "scalable" than creating something over xmpp.

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Also check out this Erlang/OTP AMQP server: http://www.rabbitmq.com

AMQP is very interesting. Check it out if you are building a distributed system or if you have a requirement for reliable asynchronous messaging. When I last looked into it about a year ago, the implementations (all two of them that I found - apache qpid and rabbitmq) were still a little rough but it looks like a lot has happened.

It's wierd how few people in the web world are aware of asynchronous messaging.

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