Hover Activated Gestures – A Good Idea?

We are all familiar with the Pen Flick Gestures in Vista. What about hover-based gestures that get activated without the need to press the pen to the screen? How could technology like this helping you with your Tablet PC experience? Take it a step further – what about capacitive-touch based hover gestures? How about multi-touch hover-based gestures?

Here is a video and PDF paper by Microsoft Research’s Ken Hinckley and Tovi Grossman exploring the idea of hover-based gestures.