From the NY Times -- The optimistic point is that the world isn't coming to an end just because car choices have shifted http://www.nytimes.com/2008/06/04/business/04leonhardt.html?_r=1&hp&oref=slogin
That article pretty much refutes the Hummer vs. Prius BS by CNW Marketing. I will point people to that the next time it comes up on another forum that I frequent.