How to read the gyro data from Wii Motion Plus by an Arduino.

A small acceleration sensing device in form of a USB stick.

Maze in a Box is a portable game in which you tilt a TV to navigate your way around a 3D maze as though you were in it.

The Weeboy is a portable color video game system that is not dependent on stationary displays or external power sources and features novel tilt-based control.

The MP3 player does not have any buttons nor dials that shown in right photo and it has an acceleration sensor instead of the mechanical switches. Therefore all playback commands to the player are given in defined motions, such as inclination, tilt and shock. The player detects the motion with the built-in acceleration sensor and recognize it as a playback control command. As the result, it came to not seem an audio player in appearance.

...or Would you like to built your own Wiimote? :)

I've published the article about AVR-based accelerometer a few days ago. Here is another stuff with Microchip PIC.

Jesper Hansen's accelerometer named AccelR8 based on Analog Devices' MEMS chip

This article shows how to use an use an accelerometer as a mouse. The project uses a MEMS X/Y accelerometer, a PIC microcontroller and a old mouse. It also describes a trick for powering the new mouse with the unused RS232 serial control lines.