If you've got a pool you like to bring some music with you when you're in it, this wireless speaker can bob in the water with you. All the while your iPod is someplace else staying dry.
The dock itself is equipped with Bluetooth and can hook up to any MP3 player. The only thing that worries me is that they don't actually say if the speakers are completely waterproof. It would be common sense that they need to be, but I tend to get a little suspicious when they leave out keywords like that.
The speakers will play continuously for up to 4 hours and they are being sold for $119. If that's a little too steep of a price for you, there is a cheaper alternative.