zsouthboy: you are wrong about the first three star wars already being written. lucas planned a 9 movie trilogy at first, but did not write 9 movies. he wrote an outline of what those movies were to cover, not entire movies. 7-9 were not very detailed at all, so they ended up being condensed into return of the jedi. the true ending of 9 was to have the empiror killed by vadar. leia was not even luke's sister originally either, it was someone to be introduced in 7 or 8.
as for 1-3, those were more detailed, but by no means entire written movie scripts. further more, they are quite different now than they were back then. one example is that 1-3 were supposed to focus on obi-wan kenobi, now the focus has been shifted to anakin. if you want to know more you should go theforce.net forums and ask, those guys know everything and will cite actual quotes from rick mccallum, etc.
oh yeah... nintendo rules.