Gargantuan. 700+ items I think. It just all adds up over time - what with D&D (various flavours - AD&D 1e & 2e (modules and boxed sets including Al Qadim, DL, Dark Sun, and Planescape etc), Dungeon magazine, Basic, Compendium, 3.5, FR, Eberrron, DL, D20 OGL, Pathfinder, Conan, AE, IH, Castles &...