For HN readers in Berlin: we're having a hackathon about VIE, Create.js, and Hallo next week. If you're interested, add yourself to the event page on Lanyrd: http://lanyrd.com/2012/createjs-hackathon-berlin/
We started with Aloha as well, but some of the project partners needed an editor option with more permissive licensing (Aloha is AGPL, Hallo is MIT). And of course getting rid of the huge ExtJS dependency was a plus.
Here is an old video interview we had with the Aloha Editor team back when things were just getting started: http://vimeo.com/12914595
This looks really interesting especially for editing large blocks of data that are generally static (think something like a profile summary instead of something like a blog post). I'm definitely going to try it out in a little weekend project I am working on.