Google Consumer Surveys is ground-breaking. Sure, there have been other folks in this game before but I think Google has the right scale to make this really work with people all over the Internet. I just stumbled-upon this but this is going to be part of my toolkit.
Tim Ferriss, famous for his Four Hour Work Week book, used Google Adwords to do some split A/B testing of book titles to see which one garned more responses. His total cost? $150. Just about the same amount Google suggests to make consumer surveys statistically significant.
Very cool Google. I like it.
Google Consumer Surveys (by Google)