Ok so I got my iPhone 3GS UDID registered and successfully download the 4.0 software. Everything seems pretty straight forward, except on the keynote when jobs introduces that you can use pandora in the background and listen to music in this case when I opened pandora and exited with the music on it automatically stopped as if it wasn't open in the background. Is multitasking supported with apps download from the app store or at the moment only apple applications due to the fact the developers have to implant the API for multitasking on there application???? If anyone is interested in 4.0 and to get there udid registered let me know only limited amount left....