UPDATED 12/10/2010 Now it calculates direction! I have made this project to calculate the speed of the mouse! It is like the Wii, except it uses the mouse instead of a Wii remote. Feel free to use this, but remember to give credit! So far, I have used this in one project, Scratch vs his evil twin http://scratch.mit.edu/projects/OrcaCat/2129443 .