If you are thinking about how the Palm Pre has pages for multiple apps it does not work that way with Android. You can multitask with Android simply by opening a app, say Pandora, hit the home button while music is playing and you can open up another app... to get back to Pandora simply swipe the notification bar down and tap Pandora. To get back to the previous app simply hit the back button.
Thats what I have been doing. If I want maps and trapster open, I open 1 then close it and open the other then just switch them that way, once it is stored in memory. Kinda a pain wish i could open them at the same time, oh well maybe 1 of the updates will allow that.