So there seems to be a mini-trend developing - Radiant is a new way to play Exalted that requires the Exalted core book for reference. Apocalypse D&D is a mashup of D&D and Apocalypse World that requires the (A?)D&D player's handbook for reference.
Anyone seen any other such games?
This makes me want to pick up my copy of Mage: the Ascension or Unknown Armies and reimagine such a game with a new system, but somehow require or encourage use of the original game's book to play the new faux-clone.