Rain Yupa
(Warning, so no one misses it like I did: There are TWO secret endings, not just one.)
they're called stingers. well, usually "the stinger" i assume it's pluralized as one would expect. i don't know why they're called that though.
also the one after ALL the credits is probably the least worthwhile, but funniest of any marvel movie i've seen.
as for the movie itself: it was pretty awesome. I'm kinda sad they couldn't get edwardn orton and continue the hulk from the last movie that wasn't awful, but other than that, great stuff. i cried manly tears during that one scene. i'll spare any more than that since spoilers.