Normally I don't take "Satoshi is x" threads too seriously, but since Severian started this one, I decided to take a closer look.  If Satoshi isn't Okamoto, he might be one of Okamoto's co-authors.  One could make a list of all of his western co-authors (there aren't that many) and see if any of the names connect with anyone known in bitcoin circles.  He co-authored a paper with David Chaum in 1991 titled "Direct zero knowledge proofs of computational power in five rounds."  The coding style of the Satoshi client is consistent with someone who learned programming before 1990 or so.  I think there's a good chance Satoshi is still active in bitcoin circles, just operating under a different pseudonym.  One could entertain a study of all the pull requests submitted by pseudonymous persons over the last two years and see if any suggest that they came from someone with a very intimate knowledge of the code.