Scrum Cards was one of my first real plunges into javascript with a library (prototypejs in this case). It's not around anymore, but I'd love to get back into it.
The idea was that a team had this "scrum cards" board up, created tasks, and drag them from board to board. Cards could also be estimated (scrum poker). Each card had an initial on it according to whoever was working on it.
When one team member moved a card on the board, it would nearly instantly animate on everyone else's board to the new position. Here's what the main dashboard looked like:
