Had the droid for a few weeks now. Digg the phone a lot, but I have suffered from three issues one of which made me late for work.
Alarm never went off, and I know for a fact it didnt since I have the Chicken sound on full blast.
Autobrightness disables itself at times. Reset it, and it worked fine.
The Ring volumn is set for full, but yet rings at low as well as all other sounds. A reboot fixed this.
The alarm issue may be tied into the volumn issue, but I am suffering from the same "iPhone non working alarm" and already gave my Director at work that excuse!!