Tutorial - 125,126,127,128 - Accelerate sensor

http://www.youtube.com/watch?v=WgKTY_RSFyM
http://www.youtube.com/watch?v=F0Gr9uL4CvQ
http://www.youtube.com/watch?v=BlmavgYIfuk
http://www.youtube.com/watch?v=zKsuyn_HKv4