Pocket PC remote for Mini Mac

I have recieved help that tell's me that I can use an iPhone/iTunes as a remote for a Mini Mac. I would prefer to use a Pocket PC. Does anyone know of software to allow this and doing this?
For 139$ you can buy a usb itunes remote with a small screen at mac connection. I've been meaning to try it...
Try Signal.

I don't have any direct experience with it but the Salling Clicker software has been highly recommended for just that purpose. According to their site, it works with 300 different PDA's and cell phones.
Could you run the sonos system via the signal software from an iphone?