Adam Wiggins believes that now is the time of horizontal scalability achieved by using resources that are transient, shardable and share nothing with other resources. He gives as example several applications and a language: memcached, CouchDB, Hadoop, Redis, Varnish, RabbitMQ, Erlang, detailing how each one applies those principles.
Adam Wiggins is an entrepreneur, Rubyist and open source advocate. His current venture is Heroku, the instant deployment platform for Ruby and Rails. He blogs about technology and business at: http://adam.blog.heroku.com/
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Indeed you stuffed a lot in that presentation, but it sure gives a good overview of what's involved. I am using a technology which is similar, at least in principle - called RedDwarf. Not sure if you have had a look at it, but it claims to provide all the three cornerstones of horizontal scalability that you have elucidated.
Thanks for a great presentation.