Android uses their 'notification center' (I forgot what it is called) to monitor progress of an app download or update. It's been pretty handy, as sometimes when I'm pounding out email on my work Razr, updates come through automatically, such as Google Maps, which I use for navigation. I can check the progress quickly to see if it is done without leaving my email.
I say yay to it in the notification center, not a pop up.