http://www.reghardware.co.uk/2007/09/11/hd_dvd_51gb_approved/
"The DVD Forum, the organisation that oversees DVD and HD DVD technology, has approved Toshiba's proposed triple-layer, 51GB disc structure. The move paves the way to exceed - for now, at least - the 50GB capacity of a two-layer Blu-ray Disc."
(Guess I'll have to buy the White Album again...)