There's FiveSecondTest (http://www.fivesecondtest.com/ http://www.fivesecondtest.com/) that shows an image of your website for five seconds and asks users for t

There's FiveSecondTest (http://www.fivesecondtest.com/ http://www.fivesecondtest.com/) that shows an image of your website for five seconds and asks users for their feedback. Not enough time for users to read all the text, but it's good at seeing if your general point is getting across. It's free too.