language/lib choice for highly available web app

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1. What language/platform is easiest for making a highly available, non-blocking, distributed, concurrent (excellent multi-core utilization) web application?

What language/platform is easiest for making a highly available, non-blocking, distributed, concurrent (excellent multi-core utilization) web application?   Web Server (nginx, lighttpd, etc) Thrift C/C++ Tornado/Twisted/Python Don't worry about it Yahoo's Traffic Server Go Erlang Java Ruby Javascript and Node.js Scala

Other (please specify)