Invisibility App: The app uses the iPad's rear camera and gyroscope to display the background image on your screen, even when you move the tablet around. It's so seamless that it makes the iPad look almost invisible. $1 Koder: It's a code editor app for the iPad, which is a little like throwing a manual transmission in a Prius. There's probably only a handful of dudes who would want such a thing. No matter though, Koder for iPad has a lot of what you'll need to geek out: syntax highlighting, a snippet...