After installing an AUX input to the radio of my Mini a while back, I got sick of continuously having to plug my phone into the cable I wired up, and needed to go wireless.
Bluetooth A2DP receivers allow a phone to send music-quality audio to a receiver device, and this is the way I wanted to go. But for a while, they were just too expensive - around $50 for a receiver, so I put it off...
Until I discovered this cheap module on DealExtreme. At only $14, it's hard to go wrong!