i have arduino uno, usb host shield, usbhub with 2 ports, and two mice. i would like to get X and Y position for two mice in the same time.
You might want to start here:
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1249568663
...and try to get -one- mouse working, first...
If you use some old trackball style mice you might be able to read directly from the rotary encoders... is that an option?