Other Bluetooth music receivers exist, but they're not nearly as small and glamorous as Belkin's model here.
Stream music files from your A2DP-supported phone over Bluetooth, and the receiver will pick it up, and play through the speakers you've connected via the supplied RCA or 3.5mm cables. It'll detect a Bluetooth-enabled phone from 33-feet away, and as it's only $50 it could solve some of your audio problems fairly quickly. No, sadly it won't label your iTunes collection properly. [iPodnn]