I probably go with the economic version of peak, i.e. when demand exceeds supply and prices start to go ballistic.
However of course then we get demand destruction, an nice euphemism for recession/depression, which in theory means we get to cycle through peak(economic) several times with things getting worse each time.
So given the current trends in price I'd say we've started up the slope of peak 1, which should nicely finish off a debt ridden U.S. economy, but that arugment belongs in a different forum.
This then gives the rest of the world 2-5 years respite until China and India fully take up the slack at which point in time its off to a quiet mountain retreat in the hope that the fallout doesn't make it this far south until its cooled off a bit
By way of introduction, as a complete newbie. I live in Melbourne Australia. I've been PO aware for a bit over a year. So far I've read Simmons, Kunstler, Heinberg and Leggett. My worst case scenario NOW, my best 2012.