I use a Philips wake-up light. I've also heard good things about Lumie. They wake you up with graduallu brigtening light rather than any sound and I could never go back to a daily alarm clock.
I do also have music (usually a radio station) come on about 15 mins after the light reaches max, (a) in case I don't wake for some reason; and (b) because I like listening to music in the morning.
I have a Phillips as well. If I get a decent amount of sleep the light will wake me up, otherwise, it starts making bird/owl noises that will wake me up. They come in soft and gradually get louder. It is much better than a loud electronic beep.
I do also have music (usually a radio station) come on about 15 mins after the light reaches max, (a) in case I don't wake for some reason; and (b) because I like listening to music in the morning.