A stylus that can help you not just take notes but also work with your apps more quickly, precisely, and even automatically (e.g., based on your position or grip) could take using your mobile device to the next level. This will depend, of course, on whether such an ePen ever comes to market (Microsoft filed the patent application in the first quarter of 2011) and how much it will cost. For now, we're stuck with imprecise fingers and primitive styluses--but hopefully not for long. Follow (@melaniepinola) and on Twitter