Windows SideShow for Windows Mobile Developer Preview This Windows SideShow version is nor the first version, neither the final version, but Microsoft launched it so you can fiddle with it if you absolutely need to.

Windows SideShow is an application for Windows Mobile 5.0 or later which will let you use your Windows Mobile device as a Bluetooth SideShow compatible device. Your phone becomes an extra window in your PC. You can access your computer information from your smartphone and you can control the PC with a gadget interface. Whenever the phone is out of range, or whenever the computer is off, you can still view any content that was previously sent to the phone.

Curios about how SideShow works? Follow the link to download this download the developer preview.