You can't stream from your iPhone/iPod straight to Airtunes, but the latest firmware release does include the Remote application, which will allow you to use your iPhone to control an iTunes library (or AppleTV), and crucially includes the ability to choose which speakers your sending the music to.

I'm now just waiting for the chance to try it out in the living room, streaming from my machine upstairs.

I imagine you'd have to write a new app, rather than attempting to modify mobilemusicplayer, mind you, if it stores music data in a format similar to iTunes it can't be hard to grab the tracks, cross compile something like DVD Jon's Justeport and build a menu... hmmm, maybe it might be a little tricky

Good luck!

It looks like I'll have to work it out myself, and I've registered a Google code project to keep track of things. No code yet, but I'll try to get something working over the weekend. http://code.google.com/p/airpod/

There's already software for the iPhone that allows it to transmit items from your on-phone library to an Airtunes receiver.

Where?! To me thats the more useful way round - and its certainly feasible as a 3rd party app (as airfoil and the works of DVD Jon show) but I haven't come across an ARM compiled version or any app that runs on an iPhone/iPod Touch (I presume it'd have to be a terminal app to begin with?)

If it's not currently possible, I think I'll have to see what I can get working - I know that Airfoil is able to transmit arbitrary audio to an Airport, so it should just be a case of doing some research and finding out how they're doing it.

Jon

For whatever reason, the Airtunes protocol uses different keys when it sends or receives music. The keys necessary to transmit music to Airtunes have been reversed and released publicly. As far as I've seen, the keys to receive music streamed from the latest version of iTunes have not yet been reversed.