We have thought about this a number of times. Here's my problem with it...
1. They need to have a choice of buzzer, radio or ipod, because not everyone has an ipod, they need to be functional for others.
2. They should have a headphone jack 3.5mm, because not everyone uses an ipod/iphone. (To be honest, our MP3 player is Creative Labs and my mobile is Samsung.) And nope... not interested in going Apple.
Sony has a number of these units as well. Been looking at Sony's ICFC707, which has an 3.5mm jack, but the large displays on these units are what I'm afraid of. I have enough guests who unplug the alarms because of the light.
I've been really tempted by the Sony Dash (HID-C10) which connects on wifi. Essentially a Sony version of the Chumby. 7" touch screen. The new version is the Chumby 8. But I constantly worry about guests not being able to handle technology.