A summary of post-debate polls:

The CNN focus group voted 15 to 10 in favor of Obama over McCain.

A CNN poll of viewers (40% Democrats, 30% Republicans) voted Obama the winner 58% to 31%. McCain's unfavorable ratings rose during the debate. Obama was rated more likable.

Independents in the CNN poll rated Obama the winner 57% to 31%

MediaCurves.com reported a poll of 1402 people. Republicans thought McCain won 70% to 18% with 12% undecided. Democrats thought Obama won with 81% to McCain's 10% with 9% undecided. Independents thought Obama won 60% to 30% with 10% undecided

Fox News' unscientific poll (web based) with 46,341 responders: Obama 67%, McCain 33%.
(This result makes me wonder whether Obama supporters are flooding the site.)6:30 a.m. update: I could not find a poll update at the Fox web site. I'll keep looking.

AOL's unscientific poll (web based) with 376,408 responders showed Obama winning the debate 48% to McCain's 46%.

MSNBC's unscientific poll (web based) showed Obama winning 83.9% to McCain's 12.9%.

An MSNBC focus group in Kansas City voted that Obama won the debate 20 to 7.

A CBS rationally representative sample of 638 debate watchers who identified themselves as uncommitted indicated that 53% thought Obama won the debate, 22% thought McCain won the debate, and 25% judged the debate a tie.

An unscientific (web based) CBS poll showed Obama winning 84.7% to McCain's 13.06% with 2.06% judging the debate a a tie.