10 min video clip from DrupalCampLA
http://www.bryght.com/blog/roland-tanglao/10-minutes-on-drupal-deploymen... has an excerpt from a really great discussion that ensued at DrupalCampLA during Firebright's dissertation on how hard it really is to properly upgrade the featureset on a Drupal site that's live and active.
Very important topic
I felt this was one of the major topics for developer and teams - beyond just Drupal, and it's great to see a focus on delivering a better platform for Drupal.