Glad to see the interest in this new form of market research. YC S12 company Survata.com offers a similar service. We can run multiple questions at a time, so researchers enjoy the ability to cross-tab responses (an important ability you lose when you run only 1 question surveys on other services). We encourage you to check us out at Survata.com (we give all first time users a $10 coupon) and we welcome any feedback.