W3C MobileOK To Help Make Web Sites Mobile Friendly
http://validator.w3.org/mobile/alpha
http://www.w3.org/TR/mobileOK-basic10-tests/

Today, W3C provides new means for people to create and find mobile friendly content. W3C invites Web authors to run the alpha release of the W3C mobileOK checker and make their content work on a broad range of mobile devices. The checker runs the tests defined in the “W3C mobileOK Basic Tests 1.0” Candidate Recommendation.