Unless I've simply missed a ton of WotC's marketing, that number looks to be at least two times too large.
I count 22 game products, 30 novels and three miscellaneous Eberron products:
[sblock]
Game products
2004/06 Eberron Campaign Setting
2004/07 Shadows of the Last War
2004/09 Whispers of the Vampire's Blade
2004/11 Sharn: City of Towers
2005/01 Grasp of the Emerald Claw
2005/04 Races of Eberron
2005/07 Deluxe Dungeon Master's Screen
2005/07 Five Nations
2005/08 Deluxe Eberron Character Sheets
2005/08 Explorer's Handbook
2005/10 Magic of Eberron
2006/01 Player's Guide to Eberron
2006/04 Voyage of the Golden Dragon
2006/07 Secrets of Xen'drik
2006/09 Faiths of Eberron
2006/11 Dragonmarked
2007/02 Secrets of Sarlona
2007/04 Eyes of the Lich Queen
2007/06 Forge of War
2007/10 Dragons of Eberron
2008/02 City of Stormreach
2008/03 An Adventurer's Guide to Eberron
(22)
Novels
2005/02 The City of Towers
2005/03 Marked for Death
2005/05 The Crimson Talisman
2005/08 The Binding Stone
2005/10 The Orb of Xoriat
2006/01 Road to Death
2006/02 The Shattered Land
2006/03 The Grieving Tree
2006/04 Tales of the Last War
2006/05 Thieves of Blood
2006/06 Voyage of the Mourning Dawn
2006/07 In the Claws of the Tiger
2006/09 Blood and Honor
2006/10 Queen of Death
2006/11 The Gates of Night
2006/12 The Killing Song
2007/02 Flight of the Dying Sun
2007/03 Forge of the Mindslayers
2007/04 Bound by Iron
2007/05 Night of the Long Shadows
2007/06 Legacy of Wolves
2007/07 The Left Hand of Death
2007/08 Storm Dragon (hardcover)
2007/10 Rise of the Seventh Moon
2008/02 Sea of Death
2008/03 The Darkwood Mask
2008/05 Storm Dragon (paperback)
2008/06 Dragon Forge (hardcover)
2008/08 The Doom of Kings
2008/10 When Night Falls
2008/11 The Queen of Stone
2009/04 Dragon Forge (paperback)
(30)
Other stuff
2005/09 Dragonshard (PC game)
2006/06 Eye of the Wolf (comic)
2006/06 Dragons: Worlds Afire (anthology novel)
(3)[/sblock]