There comes a time in every trademark's life where it either returns back to the public domain, or takes the leap into registered status. To that end, I now introduce you to the new and improved Windows® SideShow®! Yes, SideShow is now an officially registered trademark, and to commemorate the occasion we've gone and revised the Windows SideShow Use Guidelines document with the new "bugs". In addition to changing the "TM" to "®", we've also relaxed the usage requirements around gadgets; for example, it is now acceptable to use "Windows SideShow gadget" instead of "gadget for Windows SideShow" (but note that devices must still be addressed as "Windows SideShow-compatible"). If you are using or referencing Windows SideShow in your products or materials, it is extremely important you adhere to these posted guidelines. We know this can be a bit confusing, so if you have any questions on appropriate usages, just let us know.
For up-to-date information on Windows SideShow and other Microsoft trademarks, head over to the Trademark Guidelines website here: http://www.microsoft.com/about/legal/trademarks/usage/default.mspx.