With respect to presentation, Romney won, without a doubt. Although his pace of speech lost me a few times, he was clear and articulate, and had a quick answer for Obama. He lost points with me for arguing with the moderator, but overall, I thought he sounded better.
Obama didn't have his best performance tonight. He stuttered, stammered, and passed up opportunities to nail Romney. I don't know if he was just short on sleep, or if something is weighing on his mind to the point of distraction, but it made him look unprepared. If Obama's performance tonight was intentional, he needs to fire his debate prep team immediately.
As far as what kind of effect the debate will have on public opinion, we'll see. I think Romney won the debate, but his "zinger" about killing Big Bird is going viral, and I doubt that's the message Romney intended to convey. I also suspect that fact checkers will not be kind to Romney over the next week.