[mewzilla]

With those teeny li'l forearms, my money's on scavenger.

[ko_kyi]

Another thing - since predators are usually pretty fast, that thing would have had to eat ridiculous amounts of food. Are there any non-sea predators anywhere close to that size?

Scavenger makes a lot more sense. It is big enough to shoo away actual predators from their kills.

[Gorjus]

With those teeny li'l forearms, my money's on scavenger.

Um, and that logic applies to boa constrictors how? (*smile*)

Actually, I agree it was likely to be a scavenger, but I saw an interesting show on Discover (or something) that offered an interim condition. Carnosaur teeth were so full of rotting meat (didn't brush or floss, y'know) that they were really likely to cause a serious infection with even a single bite.

So, here's a scenario. T-Rex comes upon a herd of very slow-moving sauropods (using their smell to find them if nothing else) and snaps at one of them. If he connects (happens reasonably often, even if he can't see well enough to bite at specific vulnerable areas and achieve a quick kill), the sauropod gets infected with whatever was growing in the T-Rex's teeth and dies. T-Rex (one or another of them) finds the carcass and feeds on that.

What I like best about that sort of image is that it's not a simple either/or model, and life is usually full of strange combinations of things.