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Really nice. Can anyone comment on the architecture/stack used to create this, esp. with regard to the front end?

Sure - the front end is basically a Rails based custom CMS that allows us to write content in 'RubyMonk flavoured' HAML.

This is backed by servers that are running a bunch of eval loops using the Secure gem. See https://github.com/c42/secure if you're interested in the SandBoxing.

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