Here it is at last! Knockout 2.0.0 contains a huge set of improvements since the 1.2.x line. If you’re using KO already, see below for some of the highlights. Published Dec 21, 2011 New to all this? Now’s a great time to check it out. Knockout is an MVVM library for JavaScript – it makes rich dynamic web UIs easier and cleaner to build. The best place to start learning is with the interactive tuto