Recently I wrote about the Sony Blutetooth receiver/transmitter. One thing that I don't like about using Bluetooth is the latency. For example, I have a midi keyboard as part of my teaching station and I really can't use it to play in time because the Bluetooth is delayed. Audio is therefore also out of sync if I project videos from the LCD projector that is on my cart.
This solution does not use Bluetooth so you can't pair your iPhone or Touch to it, but if you use a recording/teaching cart and want to funnel the output of your D/A converter wirelessly to your stereo, this looks like a great solution. It was designed for allowing guitarists to go wireless, as well as an in-ear monitoring system, so the latency specs (under six milliseconds) are excellent. These units can also run off an internal rechargeable battery for about five hours. $99 bucks, and you'll need two. Range of almost 50 feet, so better than Bluetooth in that regard as well.