You know, the more I think about it, the more I like this Town Hall idea. It further cements just how fucked McCain is. If you look at the criticisms about McCain's speech last night, there was just as much about the aesthetics of the whole thing and McCain's stage presence as what was said. Also, as Maddow pointed out, McCain doesn't do well with spontaneous speaking- that's actually where he's fucked up the most. And now, he has to stand next to an energetic, younger, taller person which will only amplify the notion that McCain would be the oldest man ever elected president.
As for the questions, McCain already starts out with a handicap because of his links to the party. From what I've heard of his "ideas", they don't distance themselves from the last 8 years of the GOP nearly enough to be visible. He still won't admit that the Iraq war is a mistake, which is something that impacted Hillary's campaign and was part of what nullified her experience argument.
Then, after the Town Halls end, the next event is going to be the DNC convention, where Obama once again gets to give a historic speech as he officially accepts the nomination on the anniversary of the "I Have A Dream" Speech. Media coverage like you wouldn't believe, and I also expect Obama to give one hell of a great speech for that event. And I would assume that after that, Obama would go back to stumping and doing what he does best.