one thing i love about backgrounder with the 3gs is that when i am running a navigation program, the dot on the app representing my car will still move when the app is running in the background. on my 3g, it would have to update the dot to where my car was when i reopened the app. i really enjoy this because i plan on running g-maps, trapster, and slacker/pandora at the same time so i can hear music, use navigation through g-maps, and get trap alerts through trapster (since the gps point will still move even though its running in the background) i hope it works like this!