iPhone 4.0 Multitasking Preview: Exposé-Like App Switcher

It's another long-standing rumor. Every other competing mobile OS, including Google's Android, Palm's WebOS, RIM's BlackBerry, and Microsoft's Windows Mobile, is capable of running more than one third-party app at a time. But on the iPhone, if you're listening to Pandora and have to quickly look up a restaurant on Yelp, you've got to shut down Pandora, open Yelp, find your listing, shut down Yelp, and then restart Pandora--and by then, you've lost the song you were listening to, and if you...