Rational response to a professional rejection

So the "interesting news" mentioned in my previous entry is that I was at the time doing the interviewing and recruiting dance with Google. I heard the final word from them yesterday, and they aren't going to offer me a job. I may post some more detail later about the interview process (the non-technical details. The technical details are covered by an NDA), but not tonight. It seems that at this point I have a few choices of how to deal with the upset from being told "you don't have what we need":

• Screw them, screw the recruiter who contacted me out of the blue, screw it all. Throw a temper-tantrum.
  
• Ponder the inadequate nature of me, and get (more) depressed.
  
• Forget it all, and try to just go on like they never talked to me in the first place.
  
• Try to come up with a list of what they didn't like about me, and see if I can figure out how to improve those areas
  
• Same as above, but set as a specific goal re-applying to Google in a year. (Though this time, I'd limit myself to the NYC office, given how jmartin2 greeted the prospect of a move)

Obviously, I'd like to be able to embark on one of those last two options. So what, from Google's point of view, are my weaknesses?

( Help me get better )