In Insert Coin, we look at an exciting new tech project that requires funding before it can hit production. If you'd like to pitch a project, please send us a tip with "Insert Coin" as the subject line. If you're like Charles Mangin, you love your iPad or Android tablet, but wish it was a little more Wacom-esque. But why wait for hardware manufacturers to bring the styli to you? Mangin has concocted the PressurePen, a pressure-sensitive stylus that plugs into a tablet's audio jack. The peripheral sends a tone to the tablet based on how far the tip of the pen is pushed i
