Looks very interesting. Like a combination of Subtask and Trello. Each of those have limitations that keep me from adopting it for all my note-taking and project management... Perhaps this is the perfect middle-ground.

One thing, though: That demo video went waaaaaaay too fast. I couldn't keep up with it at all, and just stopped watching. I understand you're trying to fit all the many features into a single, short video, but that's just too much. Why not go at normal pace and just feature the most "a-ha!" features?