Here comes 4E and yet another version of the Tarrasque, while I think this latest one is better it still doesn't capture for me what the monster should be. So I figure I should put my money where my mouth is and do my own version. If I were to ever use it in my campaign this is what it would look like. Little bit shark/rhino/armadillo/dinosaur. This thing is supposed to be a living weapon, so I ditched the dinky horns and made him more battering ram like, made his tale more smashy, and gave him a shark like jaw since it eats everything it'll need a constant supply of fresh teeth. Also I felt the shell was a very distinctive feature of the creature and made it more prominent. And it's red becuase red is scarier.
I've never thought any of the images Dnd brought us of the Tarrasque were apocalyptic enough. The thing should be a walking personification of the End Times. I'm sure it's eaten at least a couple batches of hero by this point.