auris skye: WiFi Music Receiver for your Dock
It works great with my Logitech 30 pin player.  It's always on, so all you have to do it choose it in your iPhone's (if you have an iPhone) menu and your music will be delivered to the dock.  I just wish I had gotten 2 during the kickstarter campaign.<br /><br />Get it if you're thinking about a gadget like this.