About a week ago, I bought a
Samsung ATIV 500T tablet. I personally really like Windows 8 on a tablet - the user interface is very nice.
This tablet makes an excellent software remote!

My theme is full-screen with movement locked so normally you never see Windows. I have a Minimize button on the remote to easily peek under the covers as needed though. With the Windows 8 UI, it's also very easy to get to the Start screen to run other apps.
On a side note, Windows 8 includes a Remote Desktop app that is the nicest touch-usable RDP app I've ever used. Last night while I was watching a movie, I was switching between the software remote, an RDP session to a server that was doing a large file copy, and a web browser when I wanted to look up something about the movie. The Windows 8 UI made it all very easy.