Windows Media Center Gadgets for Windows SideShow includes four gadgetsâ€”TV, Music, Pictures and Video, and Now Playingâ€”that you can use to control most Media Center functions from a SideShow-compatible device.
For instance, you can use the TV gadget to browse the program guide, schedule recordings, and browse and play back recorded TV shows. With the Music gadget you can browse and play music. Use the Pictures and Video gadget to browse pictures on your device and play slideshows and video. The Now Playing gadget provides information on what is playing in Media Center and provides playback controls like those on your Media Center remote.
To run the Sideshow gadget on your Windows Mobile smartphone, you will need Windows SideShow for Windows Mobile Developer Preview installed on your Windows Mobile device.
The connection between your PC and Smartphone is via bluetooth, so battery life issues are not a great consideration.
Try it out by downloading the Windows Media Center Gadgets here.