2009 futures are at $63 - so $35 and $90 in 2009 are of roughly equal probability

Right, and actually if you look at option prices (I had to go to 2010 because it is more liquid, being a round number) the prices of $35 and $90 options imply about a 20% chance that the contract price will be outside that range - either less than $35 or more than $90.

I'm sure many people here don't find that too surprising; they're probably all sure that the price will be over $90. But the smart money says that below $35 is equally likely as over $90 - about 10% in each case.

what i think is more likely is that demand outstrips supply in the next 18 months, causes spike above $90, and the ensuing economic dominoes collapse world economy leading to supply (at that near peak point) far outstripping demand, and the marginal barrel heads below $35. volatility will be extreme and as Ive discussed previously, volatility itself can be worse of an enemy than expensive oil
So you think that since we may fall a tad short in the near term, the entire economic system worldwide will collapse?  It takes a LOT longer then 18 months for something like that to happen.  Just look at the 70's~
Halfin, I'm on track with you much of the time, but pedantic soul that I am, I must remind readers that it isn't "smart money" that says.  It is the past statistical pattern, which if countinued, will produce prices with an 80% probability of beinf within $35 and $90.

Our best guess is that the pattern will continue, but we cannot predict the chance that the pattern will be broken.

Again, the 20% outside, is the chance given the past pattern.