Color me impressed! I figured the next generation of designer-relevant input devices would come from Apple or Wacom, but surprise—it's Adobe. The software giant is venturing into hardware, and their resultant Project Mighty looks pretty damn wicked so far.
The Adobe Mighty Pen is designed for sketching on tablets, and it's got at least two brilliant features integrated with their drawing app: Since the screen can distinguish between the pen's nib and your mitts, you can draw with the pen, then erase with your finger. No more having to click a submenu to change the tool. And when you do need a submenu, you click a button on the pen itself to make it appear on-screen.
The truly awesome device, however, is the pen's Napoleon Ruler. Adobe's VP of Product Experience Michael Gough was trained as an architect, and wanted to bring the efficacy of sketching with a secondary guiding tool--like we all once did with our assortment of plastic triangles, French curves and the like--to the tablet experience. What the Napoleon does is so simple and brilliant, you've just got to see it for yourself:
Presumably they're still working out the kinks, as the release date is TBD.