Popular Vote
Based on a guesstimated 120-million vote turnout, with a fudge factor of a little less than 1/10th of 1%:
Barack Obama (D) -- 54%(63.6 million)
John McCain (R) -- 44.5% (52.8 million)
Bob Barr (L) -- 0.6% (720k)
Cynthia McKinney (G) -- 0.5% (600k)
Ralph Nader (I) -- 0.3% (400k)
Charles Baldwin (C) -- ~0.15% (200k)
Charles Jay (BTP) -- ~0.03% (25-50k)
Electoral College
Obama -- 333 electoral votes
McCain -- 205 electoral votes
Yes, I know the map below looks like hell -- I'm not an artist, I just filled in colors in a public domain image by Wikipedia author Scott5114.
Dark blue represents states won by Obama. Light blue represents "Barrbama" states -- states Obama picks up because Bob Barr takes McCain down. Red represents states won by McCain.

Final answer? No. Like I said, I may revise as things develop. You'll know I've frozen my predictions when I'm willing to bet on them. On the one hand, I still have this nagging hunch that McCain will find a way to pull it off -- but that hunch conflicts with my state-specific hunches that Obama will find a way to put Florida and Missouri in play.