So as I said earlier today, I emailed the Windows SideShow team for information about what’s going on in Windows 7, and here’s the response I got:
Post-beta, we made a change to help reduce clutter in Control Panel and improve the user experience by only showing items that were relevant to the user’s current configuration. Because Windows SideShow is a hardware dependent feature, we felt it was best to only show it when appropriate hardware was installed on the PC (other Control Panels behave similarly). If you went to the SideShow control panel in the beta build, you’ll notice there’s really not much you can actually do there without a device installed.
Rest assured, Windows SideShow is still there! As soon as you connect up a SideShow-compatible device (such as our latest Device Simulator) the control panel will go back to where it belongs.
I was sceptical at first because my device (HTC Touch HD) was paired with the PC running 7, however it was showing no Windows SideShow service available in the Bluetooth properties.