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Seems like great timing with the ember conversation on the front page too. Isn't ember a offshoot of backbone?

No. Ember is a fork (conceptually, at least; I'm not sure about common code) of SproutCore: http://yehudakatz.com/2011/12/12/amber-js-formerly-sproutcor...

Ember was Amber for about 2 days but changed due to a naming collision with another project. I really read too much Hacker News.