Apple has published the WWDC 2010 keynote hosted by Steve Jobs on their site.
One reason to not broadcast the keynote live would be to edit out snafus. This year Steve Jobs could not show online demos on the iPhone 4 because of to many Wi-Fi base stations in the audience. Mr. Jobs had to ask several times that people switch off their wi-fi equipment to continue the demos. Apple did not cut out these scenes. at 40:22min. you can watch Steve Jobs getting stuck loading the NY Times on the iPhone 4.
As said yesterday, to avoid the Wi-Fi overload next time just stream your keynote live and nobody has to live blog anymore.
Watch the WWDC 10 keynote here.