Hofmockel.org

-features
modular
code hooks - Don't have to hack core to override changes.
theming
multi-sites from one code base

-downs
hard to install? - http://drupal.org/node/73537
ram requirements

hosts with Drupal loaded
http://www.siteground.com/
http://drupal.org/services/hosting

business case
http://drupal.org/node/73025

http://www.theonion.com/content/

http://www.twit.tv/
http://www.fearlessliving.org/
http://www.goodstorm.com/