Marvel is taking a page out of Warner Bros.' Harry Potter Marketing Book and is releasing more Thor posters than you can shake a hammer at.  The two newest posters show off the titular hero (Chris Hemsworth) and his rival Loki (Tom Hiddleton) having a staring contest/deciding who has the most extravagant helmet (hint: it's Loki).Hit the jump to check out the new posters, which you can pick up at WonderCon this weekend at the Marvel booth (#801).  Thor stars Chris Hemsworth, Natalie Portman, Tom Hiddleston, Anthony Hopkins, Rene Russo, Stellan Skarsgard, Jaimie Alexander, Kat Dennings, Ray Stevenson, Josh Dallas, Tadanobu Asano, Idris Elba, Clark Gregg, and Colm Feore.  It opens in 3D on May 6^th.Posters via Marvel.Here's the official synopsis for Thor:

Release Date: May 6, 2011

Director: Kenneth Branagh

Cast: Chris Hemsworth, Natalie Portman, Tom Hiddleston, Anthony Hopkins, Rene Russo, Stellan Skarsgard, Jaimie Alexander, Kat Dennings, Ray Stevenson, Josh Dallas, Tadanobu Asano, Idris Elba, Clark Gregg, Colm Feore

Paramount Pictures and Marvel Entertainment present the epic adventure, “Thor,” which spans the Marvel Universe from present day Earth to the realm of Asgard. At the center of the story is the mighty Thor (Chris Hemsworth), a powerful but arrogant warrior whose reckless actions reignite an ancient war. Thor is cast down to Earth by his father Odin (Anthony Hopkins) and is forced to live among humans. A beautiful, young scientist, Jane Foster (Natalie Portman), has a profound effect on Thor, as she ultimately becomes his first love. It’s while here on Earth that Thor learns what it takes to be a true hero when the most dangerous villain of his world sends the darkest forces of Asgard to invade Earth.