Unfortunately not all of us could make it to Boston this year. But luckily from what i understand there is a team working on trying to make audio or video recording of every presentation that they can. Being one of those people that couldn't make it, I still need my DrupalCon fix ;-)
I'll start off with the links I have seen on IRC, and I am hoping that others will include any material that they know about also. So to start things off.
mfb posted a link to an audio of the state of Drupal session:
bendiken posted a link to a video - Here's the video we made for Dries' keynote presentation at Drupalcon Boston 2008, demonstrating where Drupal can go with the Semantic Web. ... all » It includes the original narration, which is perhaps a bit more of a firehose than the narration given by Dries at Drupalcon.