i am neither an apple fan boy, nor do i own anything apple. I own an android device and a pc.
That said, no android device is as smooth as the iPhone OS. Even the N1. Anyone who argues that is lying to themselves. With the iPhone 4 "catching up" and getting multitasking, it'll be hard to beat. Plus, if those pictures are the actual ipHone 4 to come, its one of the best looking phones out. Hd2 looks awesome, but too bad it's wm6.5.
