I'm afraid I don't understand why should I care about Airplay on my iphone4. Is it to stream movies from the computer to the iphone? I already got a 24" monitor attached to my PC so why would I wanna watch a movie on the iphone's tiny screen, especially as this only works on wifi so there's no streaming on the move. Is it to stream the opposite way, from iphone to PC? Now why would I ever wanna do that? The video on my iphone originated on my PC and it's still best viewed there. Is there something I'm missing? I can see this being useful on ipad due to screen size but that's about it. Thanks!