Well, the political crystal ball got a bit cloudy. One of my VP picks, Governor Ted Strickland of Ohio, is no more: he issued a Shermanesque statement last week.
Obama still has many attractive options. He can choose Evan Bayh or Sherrod Brown if he wants to shore up the Midwest. Jim Webb is raring to go. However, my best hunch is a selection from the Mountain West, which he would really like to carry (and has to carry for 271 electoral votes, if he can't win Ohio or Florida). This puts forward Bill Ritter, Brian Schweitzer, and Bill Richardson as the most likely candidates.
McCain, from the little that I've heard, seems to be leaning more towards Tim Pawlenty. That would be a mistake; McCain needs more liveliness out of his running mate.