The marketing departments of major studios have nothing on Los Angeles' guerilla graffiti artists. This promo for Spider-Man 3 is the second of two billboards for summer superhero movies tagged by (I think) the same artist. The first of these, a Silver Surfer billboard for the Fantastic Four sequel on Melrose near Martel, has since been removed, but you can still see this one (I hope) on the North side of Melrose at Mansfield.
UPDATE: Check out the awesome Silver Surfer billboard by Augor.
Photos by Rob Takata