switch-it said:Sadface. That's, believe it or not, one of my most wanted features.
The app you're using has to be open or else it doesn't work, yes?
all alarm apps need to be open to work. but you can hit the sleep/lock button on top to shut off the screen and they still work. (I don;t think iOS 4 will change this from what we've seen of the APIs)
I happen to use Awaken for my alarm clock needs but there's lots of choice for those who want to wake up to music playlists instead of just a ringtone.