I run a service called PickFu
that leverages Mechanical Turk on the back-end. It's a service that helps entrepreneurs get instant feedback on A or B style questions, like for testing logos, value propositions, tag-lines, UI mockups etc. You'll get 50 responses within about an hour, complete with explanations and demographic information.
Here's a coupon for 25% off a single poll if anyone wants to give it a try: FD25OFF
Feel free to message me with any questions.