Palm Pre

The Palm Pre 2 smartphone has been reengineered to do more of what you want to do—faster. Quickly switch between multiple open apps.¹ Simply start typing to begin an email or update your status. Tap a message notification while you’re playing a 3D game.^2,3 With HP webOS 2.0, accomplishing more is effortless. Pause a game, tap an email notification, check your calendar, read a restaurant review, send an email reply, then switch back to the game without closing anything.^1,2 Now in webOS 2.0, your open apps are logically grouped together in card stacks, so managing multiple tasks is ridiculously easy.
For more detail.