The thing that's always driven me nuts about using a Wacom tablet is having to set the pen down to type a keyboard shortcut and pick it back up again. It breaks the workflow and harshes my CAD Zen.
Kelvin Geis' PenMoto concept on Kickstarter is the perfect solution. After seeing the video demo of how the pen and magnet ring work, every CAD jockey, photo retoucher and touch-tablet stylus user is going to want one of these:
There's 36 days left in the pledging period, with a modest target of 40 large to make this one happen.