The whole task switcher of WebOS looks like (iOS) Safari's tab-switching (with apps instead of pages of course), except with more goodness: the applications stay live (à la Android) and can be seen updating in the switcher, you flick applications off-screen to close them, it's possible to group application cards to make switching between a group faster, etc...
On iOS the app switching is handled via a list of recently open applications accessed by double tapping the home button.
You don't get a view of the app's window contents like you do in WebOS. Probably because 1) it wouldn't visually fit with the way the app switching is laid out on iOS and 2) iOS doesn't let apps run in the background, their state is frozen to disk and their process terminated when you switch.
It's all very neat, and very easy to understand. You can see the WebOS 1.0 cards demo here: http://www.youtube.com/watch?v=oUSui3rH1a8