This was long due. As couple of queries came up about making robos with uniboard, i thought of spending some time and coming up with the same. Tested it with an old ibot and works correctly. PS find the attached motor.h and related files (2 sample test programs) . These are very very simple and nothing much to say on it.
Ps note that the connections of +ve and -ve should be followed correctly else everything goes reverse. Also while testing the robot its advisable to remove the USB power and plug in external battery for the motors and while programming only USB power must be ON. Keep this note in mind else you might end up screwing up the board !!