Microsoft blogger Steve Clayton thinks he has the answer to the mystery of president-elect Barack Obama on a treadmill with--gasp--a Microsoft Zune instead of his usual iPod. Microsoft made a special-edition 4GB Zune for the Democratic National Convention. I can imagine Obama wanted to work out, realized he didn't have his iPod, and asked one of his many staffers to borrow their MP3 player.
The funniest part of this story isn't that Obama was using a Zune, but that everybody was so surprised to see one in public! Outside Microsoft, they're still relatively rare beasts.
(Tip courtesy of Todd Bishop at TechFlash.)