Summer is here and so is incentive season. GM announced it is offering qualified buyers 0% financing for three years with an additional 1,000 cash back on select cars. The program is available on select Chevrolet, Buick, Pontiac and GMC vehicles and runs 6/26-7/9. Vehicles include 2006 and 2007 models of the Chevrolet HHR, Tahoe and Silverado, the Buick Lacrosse and Lucerne, the Pontiac G5 and G6, and the GMC Envoy, Yukon and Denali. GM is riding the attention wave expected to be generated by the Michael Bay-directed live-action movie, "Transformers" (see related story). Four vehicles appear in the movie. Called the "Transform Your Ride Sale," the effort will run on TV, radio, print and online. TV spots will incorporate scenes from the new movie.