The traction beam cannot lift your car or boat but it can move really really small objects. Who knows this may solve other mysteries like dark energy :) Here is the blurb from the article in ScienceDaily:

A team of Yale University researchers has discovered a “repulsive” light force that can be used to control components on silicon microchips, meaning future nanodevices could be controlled by light rather than electricity. The team previously discovered an “attractive” force of light and showed how it could be manipulated to move components in semiconducting micro- and nano-electrical systems—tiny mechanical switches on a chip. The scientists have now uncovered a complementary repulsive force.