Blu Ray IS 1080P which Sony is calling Full HD 1080. To confuse matters more, actually HD is a variety of formats- 720P, 1080i, and 1080P. Regular SD DVD's can handle 480P and 480i only.
Cost of mass replication of Blu Ray or HD DVD is around 7-9 bucks a disc making it less desirable to low/no budget filmmakers like myself!!!