Then there's this, by the comics artist Alex Ross. Apparently it's available as a t-shirt.
This stuff is fascinating. While I'm on the subject of Obama as Superman, I'll link to this BBC article from December called "Superman Obama." It makes some interesting points about how various world economies and stock exchanges rose because Obama said he was going to invest in America on an unprecedented scale. Then there's this photo on flickr. Apparently it's by someone named Mr. Brainwash.
Enough for now, I think.