Motion Pong actually has been developed for the "Neoflash PSP Motion Kit".
It is a simple pong-game. The difference to other pong-games are the controls.
You do not move the paddle with any keys, you just move it via the Motion Kit.
That means you can move the paddle by tilting/flipping your PSP.

You may watch the video:

http://www.youtube.com/watch?v=xQS_nSVSSy4

Download: Motion Pong 0.1 

Download: Motion Pong 0.2