Those theories make the most sense to me too -- the ones that speculate there's some detail on his birth certificate that he doesn't want people to see, like that his real name is "Steve" or something...something that would make him look silly and that would kind of deflate his exotic life story. Obama is so vain that I could imagine him going to the mat to keep something like that hidden.
Just look at his signature:
Totally contrived and self-conscious. Pure vanity. A guy with a signature like this is capable of anything (how in the world would he ever work "Steve" into that?).