I gotta say, sometimes I miss my fully customized LED on my blackberry back in the day. It could be in the bottom of a gym bag and I’d still know if I missed a Google Talk message (green) or a Facebook alert (dark blue) or an email (light blue), etc etc etc.
I had a cool LED on my old Sony which pulsed to the beat of music playing. It also covered the whole of the bottom of the phone and also showed when the phone was upside down. It was well cool.