After mentioning and wondering about the easter egg at the end of Iron Man 2’s credits, its being reported that is in fact a scene related to Thor. Not revealing Thor himself, but in fact the one item missing from the picture released, Thor’s mighty hammer: Mjolnir! I have not yet had the chance to see it, since the movie will not be released in the states until May 7th, but the scene is being described as follows:
The scene starts showing a black car driving through the New Mexico desert. When the car stops, the passenger is revealed to be Agent Coulson (SHIELD Agent played by Clark Gregg) who walks over to look at a giant crater. He then makes a phone call (assuming to Nick Fury) simply saying “Sir, we’ve found it.” The final shot shows that in the middle of the crater is Thor’s hammer, Mjolnir, sitting head-down, in a similar pose scene in the comics.