The N9 has a breathing light which is only used when charging. I find it very unuseful and would like to see new apps that make use of it.

Can someone develop an app to make use of the LED and notify us when new calls, messages, emails, twits, or facebook nots?

Remember the N900? it had a white led that cuold shine in many colors depending of the notification? That would be very helpful to have on the N9.