Just 2 of 6 posters Eric Tan did for Disney/Pixar. I'm a little jealous.
Eric Tan got one of the coolest jobs around when he was asked to work with the filmmakers at Disney/Pixar on the Style guide for UP, these posters [that capture the mood of the film perfectly] were part of the guide.
He has also done work with ACME on posters for Indiana Jones and just contributed a poster in celebration of the final season of Lost.
If you didn't get a chance to see UP in Theatres, it should be on the top of your must-see list when it comes out on dvd.