Works great, but there is one bug and one particular feature that I find missing to complete the experience:

- The default group 'bubble' covers the location of a new 'bubble' when you click on 'create new group', took me a couple of minutes of clicking to realize it was just obstructed and not broken

- Automatically creating a new group when you drag a thumbnail outside of its current group.

Other than that, works like a charm :)