i have connected ps2 mouse to arduino http://www.arduino.cc/playground/ComponentLib/Ps2mouse like that, with this code http://arduino.cc/playground/uploads/ComponentLib/mouse.txt and with this i get something like this http://www.youtube.com/watch?v=Ap2IYnJMotk it works pretty cool, and i thought that, i will post it here, for someone who would like, to play with it, or maybe improve it. it would be great! greetings, adam