UPDATE: I wrote this back in May 2008, and it bears revisiting now.
RealClearPolitics - Articles - A Step Back From Enviro Lunacy: "$3 a gallon gas didn't change anybody's mind about energy issues. $4 a gallon gas did. " That was today.
Now, compare this with comments I myself made elsewhere over two months ago: "We are still in the relatively inelastic range of the demand curve. You get gasoline up to $4.25/gallon in Houston, or $5/gallon in Los Angeles, and I’ll posit that you’ll see the beginnings of serious declines in consumption." I was off by about 25¢, but I still claim it as me own.