Want to play video in your iOS 4 app? This clip will teach you everything you'll need to know. If you're interested in writing apps for the iPhone, iPod Touch or iPad, you'll need to know how to use the iOS SDK. If you're entirely new to the dev kit, however, never fear: the web is awash in high-quality, free tutorials like this one, which will teach you everything you'll need to know. For more information, including detailed, step-by-step instructions, and to get started writing your own apps and games with the iOS 4 SDK, take a look.