I've had a lot of fun making magic apps for the iPhone and iPod Touch.  I've got a couple more in mind, in the mean time, I have another DVD coming out after Inversion and I've been working on my first non-magic application for the iPod and iPod Touch.  It's a lottery ticket game where you play different scratch-off lotteries I've thought up like "Stellar Odyssey" and "Monkey Man".  It's close to completion.  Here's a screenshot of the main menu: