I was trying to figure out a way to judge Peak Oil awareness among the general public. I've seen people count Google hits and blog mentions, which are certainly a couple of good ways.
[Google hits on phrase "Hubbert's Peak" = 47,100; "Peak Oil" = 602,000]
I decided to track the Amazon sales rank of some Peak Oil books. Obviously newer books tend to do better, but let's recheck in 6 months.
The Long Emergency, J. Kunstler: 208
Twilight in the Desert, M. Simmons: 762
Beyond Oil, K. Deffeyes: 1,091
Powerdown, R. Heinberg: 1,174
The Party's Over, R. Heinberg: 3,620
Hubbert's Peak, K. Deffeyes: 3,716
The End of Oil, P. Roberts: 9,058
The Oil Factor, Leeb & Leeb: 10,571
Out of Gas, D. Goodstein: 32,896