DoubleTwist, DVD Jon's application for opening up iTunes to allow other devices access, just got the best and perhaps most ironic of adverising spacesright on the SF Apple Store. The ad space is owned by the BART and DoubleTwist is a legit application so there isn't much Apple can do get rid of it.
Perhaps next time the contract comes up, they can outbid him and put up some new itunes ads?
