Wired, on what sets the Palm Pre apart:

The iPhone’s apps are great and a big part of the phone’s appeal. But have you ever tried to listen to Pandora while you’re checking Gmail? Can’t do it. The iPhone’s limitation on running multiple apps is a serious drawback. The HTC G1 improves on that with the notifications drawer, but it’s an insufficient solution because it’s still too hard to see what’s currently running. The Palm Pre solves that problem. It treats applications as “cards” and makes it easy to flip through the deck of cards, view them at once and shuffle them. The apps are live even when minimized, and you don’t lose your place even if you move to a different one or move to a new one.