Maciej Cegłowski ( the erudite writer / painter / web hacker behind my favorite blog ever, 'idle words' ) made this cute site called 'The Wrong Tomorrow' where he posts predictions by pundits and tracks when, er, if they are wrong:

http://wrongtomorrow.com/

Should be fun to track as time goes on; I note with some glee that Scoble is the first failure. Mind you, Scoble was hardle making predictions about economic recovery, was he?