Coindesk just launched a 'Sentiment Index' based on daily polling data in the US and UK, with data going back to March. You can find it at http://www.coindesk.com/sentiment-index/
From looking into it briefly I don't see much useful information. It seems that sentiment sometimes lags the price while other times it precedes it, and sometimes predicts the direction the price will take and other times predicts the opposite of what happens. In other words, it's almost entirely random and doesn't lead to much actionable information.
Perhaps its because the sample size is limited (125 people, globally, per day), but I'm not sure that sentiment plays much of a factor in the price of bitcoin, just buyers and sellers.
What do you think?
