Game Gripper is a little addon to your N900 which can turn your N900 in to gamepad. Game Gripper have perfect design and it provides better handling. It allows you to play all those old-school games with a real game-pad feel.
The Game Gripper is easy to use just slide it on! and get playing…
The gamegripper is available in variety of colors check out their picasa album here
You can buy the game gripper here