I have the same question as @hnwh: I'm using Knockout and really, really like it (more suited to my way of working than say Backbone), but considered that Angular could be a more advanced/featureful Knockout.
If you use Knockout please consider being more vocal about it. It is a fantastic mini-framework/library but doesn't have the crazy PR behind it like backbone.
Angular is great but the problem is you really need to use client side templating for it to be useful. It also has the same syntax as django's template language by default. All this is workable but Angular is great for projects that you are starting. Knockout is better to integrate with existing projects.
Thanks to all in this part of the thread for talking so pretty about Knockout - it got me to try incorporating it tonight on a simple interactive page I started recently, and it's a pleasure to use so far. Works nicely in combination with coffeekup, which I also enjoy a lot.
Can you elaborate a bit? Thanks!