Trying out ThetaBoard right now. It's funny, it's sort of like Trello with everything I want to change about the Trello design – no pop-ups (edit in place), black/grey color scheme, cleaner typography – but then it ends up feeling more complex and busy.
I think click anywhere to open/close a card would be a huge help. Having two or more cards is confusing and destroys the 'overview' feeling that makes kanban great.
We could use more kanban products anyway – keep it up and monetize!