Easy. The dinosaurs weren't intelligent, at least not anywhere near the intelligence of humans.

Those were made for eating coconuts and pineapple anyway.
They had no use for spears,just hit up a tree and eat some fruit.
/duck

This one might be easy enough that we don't even need to call in deludedgod for backup. I recommend reading a book called "The Mating Mind: How Sexual Choice Shaped the Evolution of Human Nature" by Geoffrey Miller.

Basic idea: Survival is but one aspect of natural selection. Think about it for a minute. If you have a small pond, you probably have a couple thousand lifeforms happily surviving. However, they're vastly different. You have everything from bacteria to fish, or maybe alligators, and lots of plants... probably some algae. All of these things survive remarkably well. If survival was all there was to it, we wouldn't expect to see such diversity. We'd see the two or three things that were the most adaptive.

As it turns out, sexual choice is something that scientists are having a hard time getting a good grasp on. In many species, it seems almost arbitrary. The peacock is a great example, and is used all the time. That tail is extraneous, and actually HINDERS the peacock's individual chance to survive. Nevertheless, chicks dig it, so peacocks with awesome tails get to mate, and then there are more of them next generation. One theory is that sexual selection IS in fact pretty arbitrary. In a great many species, the female is the selector (humans, too, of course).

Anyway, intelligence in a rudimentary form isn't necessarily a survival advantage, but it does allow for some pretty impressive flirting -- a REPRODUCTIVE advantage. So, it's not hard to understand how a few generations of smart men getting laid would lead to an immediately improved intellect in homo-whatever. It's also not hard to understand how there is a point at which intellect does become a survival advantage -- when man learns to build tools/weapons. At this point, it's a downhill slope.

So, the question is not really why did humans get so fast so smart. Just get any computer geek to tell you about adaptive AI programs and their capacity for exponential growth. The question is, why are there not any other smart critters.

Well, there are actually some very smart ones. The more we learn, the more we realize dolphins, apes, chimps, octopi, and many other critters are pretty damn smart. The thing is, there are just not many critters who have the kind of physical adaptations to use intellect in ways that would promote increased intelligence. While dolphins are pretty good at figuring out how to herd fish and hold particularly attractive females captive for repeated breeding, they don't get a lot of chances to make axes.  Without the physical makeup or the natural opportunity, many animals have hit a "glass ceiling" -- so says the theory.  

The fact is, two things have to converge for intellect to develop:

1) Physical capacity for intellectual development.

2) The more or less arbitrary selection of intelligence for reproduction.

This is obviously pretty rare. (Our uniqueness proves its rarity, even though theists would like to reverse the cause-effect chain.)

Also worth noting is that we probably weren't the only really intelligent hominids. More than likely, we killed off a few competitors in the early years. Whether we did it with brains or braun, I dunno.

Anyway, maybe deludedgod wants to jump in here. He's the evolutionary expert, and that book I'm paraphrasing is a couple decades old.

You're assuming evolution has a point.

Intelligence, like a few people have said, is not inherently a survival trait.  Big teeth beat intelligence until intelligence gets, well... REALLY intelligent.  So, it would make sense that the bigguns would pretty much decimate the little intelligent ones (intelligence requires a lot of energy expenditure, and size doesn't often go with it as a result.)

See, it's Sapien-Centric to assume that just because we're intelligent, that intelligence is the end all and be all of intelligence.

If you could hang around a million years, you might find that after humans blow themselves up and make the planet unlivable for themselves that other less intelligent species are surviving quite well.

Hmm. Good points. Perhaps I am being Sapien-Centric in my thoughts on this. Your right once we blow ourselves up than perhaps the ant or something had it right all along . Still its a bit curious to me why no one else 'got smart' and 'physically adept' within the same environment with much more time? I mean 183 million years was a looooong time and the 450 for sharks was even longer. I would expect Sharks to have Xray vision by now if no thumbs? They are so far from perfect or maxed out in their environment.

Sharks are damn near the perfect predator.   I dunno why you'd say that.  They have a fantastic metabolism, they can smell a drop of blood for miles, they have refills for teeth they lose, eye covers to keep them from losing their sight, and tons of other amazing adaptations.  Why would you think they need anything else?  The only thing that's dropped shark populations has been human hunting, and humans decimating their food supply. 

I think the thing you're just not understanding is that very few environments are conducive to intellect developing as a survival trait.

Seriously, dude.  Read that book I recommended.  This is not necessarily something you're going to understand from a few paragraphs on a message board.   

There are many things that affect evolution and what is necessary for it to take place, enviormental changes, mutations that survive. Again the species adapts to it's enviroment, this is one part, second part is survival, if a mutation doesn't surivive it cannot evolve. third is the pressure to evolve, if there are no enviromental pressures to change why change? The shark and the crocodile have to this point no real need to change drastically, intelligence wise, they are suitable for their enviorment, again a species will adapt to it's enviroment, if there is a change in it's enviorment and one in which a mutation occurs to which the intelligence increases and surivives then the species will become more intelligent. However many factors must contribute before this happens.