I saw Hero at the Arclight Theater Dome in Hollywood, the one with the 86 ft wide screen, last night with my friend, It was pretty freaking sweet seeing it on a monster screen like that.
MovieWeb is great for hi-res movie pics. A lot of the landscape-shaped pictures are 1000 pixels wide, so if your resolution is 1024x768, it's not that hard to Photoshop the last 24 pixels and have a great background.