fivesecondtest.com is a cool concept where a web developer can upload a picture of his website in development and have free usability tests from other developers. Of course you can also run the test for other developers’ websites.
The five second test all comes down to finding the prominent elements in a mock-up, you have 5 second to tag down what is standing out with your mouse, and comment on your tags after. It’s fast and easy.
For now it’s in beta and it’s free, have a look!