MS recently released a beta application to use your PPC as a bluetooth SideShow device.
From the SideShow team
blog:
SideShow for Windows Mobile Developer Preview Released @ TechReady 2008!
Today we released the Windows SideShow for Windows Mobile Developer Preview. Now any Windows Mobile 5 or 6 phone can work as a Bluetooth Windows SideShow device! We've got some favorite uses of it already, including using it to control PowerPoint presentations while viewing the speaker notes, using it as a remote control to Windows Media Player, and viewing RSS feeds on the road. Really, though, we’ve barely scratched the surface of what’s possible here, and developers have the opportunity to invent a whole new range of scenarios using the software and the Managed API SDK (see below) that allows Visual Basic and C# development, so we’re really excited to see what’s going to come out next. Enjoy!
GoGadgets had an app out there that would do the same thing, but it is nice to see MS finally getting involved.
Download
here.
Edit: Full package and cab installer attached.