I read an article, and a few odd posts saying that BMW is already planning not to renew in '08, because they feel they can succesfully have their own in house F1 team. I don't know where williams would get motors, and that would hurt, seeing as BMW's motors are the best. I suppose Ford's F1 motors are good an cheap!
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"The car is the closest we will ever come to creating something that is truly alive"
-Sir William Lyons