The United States Postal Service announced today that they will release a commemorative series of Pixar stamps in 2011. This pane of 20 stamps, which go on sale August 19, includes five different designs featuring Pixar characters Lightning McQueen and Mater from Cars, Remy the rat and Linguini from Ratatouille, Buzz Lightyear and two of the green, three-eyed aliens from Toy Story, Carl Fredricksen and Dug from Up, and the robot WALL-E from WALL-E.