This is why we don't get nice things. A day after the first press/public screenings of Iron Man 2, and the post-credits sequence ends up online. Who is the cameo this time? Well, it's more of a what. Spoilers!

Even though the video's been removed from YouTube by a no-doubt enraged Marvel, Rich Johnston's Bleeding Cool has the pic that matters:

He also has a description of the scene:

A black official-looking car drives through a New Mexico desert and comes to a stop. Agent Coulson gets out and walks up to a giant crater in the desert surrounded by trucks. Agent Coulson gets on his phone to tell someone (presumably a certain Nick Fury) that they’ve “found it”.

Then, in the middle of the crater, we see [the hammer].

Considering we knew Thor was the next movie, this isn't the biggest surprise in the world... But it's still pretty damn cool.