Well, almost no errors. I think Barak confused the invention of the computer with the invention of the internet ("a group of government scientists got together because they needed a better means of communication" was how he tried to describe the invention of the computer, as an example of American inventiveness.)
Obama kind of stayed too close to the middle of the road for my tastes, but he made his points pretty well. McCain seemed kind of wooden and over-rehearsed, and towards the end, he seemed to be visibly tiring, but he came through with what was almost a rousing finish, by which I mean to say, I found it moving and - - I don't want to say endearing, but I believe that it will bring more women over to his side. He spoke of how his father was often away at sea, and being raised mostly by his mother. My gut was telling me that women would like that; his delivery was good, not overly mawkish, it sounded sincere and vulnerable. Older women will definitely love it.
But I also liked Obama's answer to the final question, the same one that McCain had used as a springboard into his "fatherless child" pitch, which was "What are the things you don't know and how will you know them?" (good question, eh? The moderator called it "Zen-like.") He seemed to be really winging it, a spontaneous answer to an unexpected question, whereas McCain's answer (above) to the same question, while moving, DID appear to have been prepared and canned.
I'd rank it as a slight win for McCain, but not enough to make any real change in the election dynamics.