This Orgel Spa is a floating, hand cord-charged ball that plays one song and one song only. It's waterproof, goes into your bath, and is supposed to give you three minutes of relaxation.
The downside is that it's $20. This would be great if you could somehow load your own MP3s on there and play it back, but it is pretty cool. As is, it'll only be a few baths before you get tired of the song and wonder why there's a pink think floating in your water. [Sega Toys via Crunchgear]