Most videos have been added to the session listings on the SF DrupalCon website: http://sf2010.drupal.org/

Cool sessions:

Best Practices For Managing a Drupal Firm:
http://sf2010.drupal.org/conference/sessions/best-practices-managing-dru...

Developing Apps for iPhone/iPad/Android using drupal as Base System:
http://sf2010.drupal.org/conference/sessions/developing-apps-iphoneipada...

Module Building for Beginners (Drupal 6 and 7) - Intro and Workshop
http://sf2010.drupal.org/conference/sessions/module-building-beginners-d...

MediaFront Module | Birds of a Feather Session
http://www.mediafront.org/drupalconsf

Stuff posted on archive.org and youtube

Archive.org:
Videos of sessions from the 2010 San Francisco DrupalCon:
http://www.archive.org/search.php?query=%22DrupalCon%202010%22

Google video search:
http://www.google.com/search?hl=en&client=firefox-a&hs=WKN&tbo=p&rls=org...