Set Driven Keys

Here's a quick test of how set driven keys could potentially be useful in rigging. Watch this playblast and understand that the whole movement came from one attribute in the channel box.
(Ignore the crappy hand model, it was only a quick botch-job for the sake of a demo.)

While this has a lot of potential, unfortunately it means the animator can no longer have individual control over any of the joints in that finger without driving the movement of the next in the chain. This hopefully illustrates the importance of finding a way around this.