Description of gameplay: Same game as the 3D pinball game that comes with Windows XP. Launch the marble ball, use the flippers to prevent the ball from rolling down off screen. You get 3 balls to start. Sorry if this is vague, I don't really know any other way to describe it...
Description of button mapping: Tap on bottom middle right of screen (in the general area of where the right flipper would be. Wouldn't have to be exact.) to move the right flipper. Tap on bottom middle left to move the left flipper. Hold on the far bottom right of the screen (where the ball launcher is) to launch the ball. The longer you hold, the more powerful the launch. There could be a pause/menu button on the top of the screen, either as a banner across the whole screen, or just a small corner box located on one of the sides. To tilt the "machine", tilt the Zune.
The pause menu would include "Restart Game" and "Quit Game" options, "Adjust Tilt Sensitivity", an option to turn sound effects on or off, "High Scores", and any other options you can think of that would be useful.
Tips/suggestions for developers accepting this request: Zune 3D Pinball is more of a dream than it is a request, as I'm assuming this would be extremely difficult. I think that it would be an amazing and popular game if done right though.