Let's see...
Wizards: 3 core books x2 (3.0 and 3.5), MM3, Fiend folio, Draconomicon, Arms & Equipment Guide, Psionics Handbook, Expanded Psionics Handbook, Manual of the Planes, Oriental Adventures, Sword & Fist, Defenders of the Faith, Return to the Temple of Elemental Evil, Sunless Citadel, Forge of Fury, Eberron campaign setting, Shadows of the Last War, Sharn: City of Towers, FR Campaign setting, Monsters of Faerûn, Magic of Faerûn, Faiths & Pantheons, Lords of Darkness, Silver Marches, Races of Faerûn, Living Greyhawk Gazetteer, Star Wars d20 v1. Total: 31.
d20: Crucible of Freya, Psionics Toolkit, Oathbound campaign setting, Creature Collection, Tome of Horrors, Relics & Rituals, Kingdoms of Kalamar 3.0 DM Shield, Mastercraft Anthology. Total: 8 more.
I might be forgetting one or two things that I keep in storage nowadays, but that's what's on my shelves plus what I can recall I put away. I also have a bunch of printed-out PDFs, but those were a separate poll.
Wizards: 3 core books x2 (3.0 and 3.5), MM3, Fiend folio, Draconomicon, Arms & Equipment Guide, Psionics Handbook, Expanded Psionics Handbook, Manual of the Planes, Oriental Adventures, Sword & Fist, Defenders of the Faith, Return to the Temple of Elemental Evil, Sunless Citadel, Forge of Fury, Eberron campaign setting, Shadows of the Last War, Sharn: City of Towers, FR Campaign setting, Monsters of Faerûn, Magic of Faerûn, Faiths & Pantheons, Lords of Darkness, Silver Marches, Races of Faerûn, Living Greyhawk Gazetteer, Star Wars d20 v1. Total: 31.
d20: Crucible of Freya, Psionics Toolkit, Oathbound campaign setting, Creature Collection, Tome of Horrors, Relics & Rituals, Kingdoms of Kalamar 3.0 DM Shield, Mastercraft Anthology. Total: 8 more.
I might be forgetting one or two things that I keep in storage nowadays, but that's what's on my shelves plus what I can recall I put away. I also have a bunch of printed-out PDFs, but those were a separate poll.