I attended an event called the LA App Show last night here in Santa Monica, CA, and saw seven demos of various apps that are seeing significant success on the App Store. Matt McMahon from 20th Century Fox was there, and while his company didn't publish the actual app in question, he's certainly seen plenty of success: he worked closely with Rovio on the creation of Angry Birds Rio, the movie tie-in that has nabbed 20 million downloads on the App Store in just 20 days of release, and has helped send the Rio animated movie to number one at the box office.
McMahon didn't talk about the actual development of Angry Birds Rio -- most of the
