The good news is, I can say this is going to happen. Julien Blache and I both have the hardware, and are working on a service you can control with iPhone/iPod Touch and plays over APX. I added the necessary database API’s for the iPhone to interact with the database, Julien is getting it to pair and login right now.
The bad news for our friends running WHS, is that is happening in forked-daapd, which runs only on Linux–and will run only on Linux until someone wants to contribute WHS support.