Plutinosoft has AirMusic (iTunes Link) in the iTunes App Store for FREE (regularly $3.99) for a limited time.

Access and stream your iPhone, iPad or iPod Touch Music directly over WiFi to an XBox, PS3 or any compatible DLNA device. No Wires or special hardware needed! It can even stream to a PC running Windows Media Player.

If you’ve heard all the hype about AirPlay and are missing out because your don’t have an AppleTV, this app is for you!