title: What's the difference between Knockout.js and Rx.js?
body: <p>Does anyone know the differences between <a href="http://channel9.msdn.com/Blogs/Charles/Introducing-RxJS-Reactive-Extensions-for-JavaScript" rel="noreferrer">RxJs</a> and <a href="http://knockoutjs.com/" rel="noreferrer">Knockout</a>?  To me on the surface they seem to be trying to solve the same problem, to build an event driven UI.  But someone who has had experience with both, how do they differ/ how are they similar?  Can you describe something about them to help me choose?</p>