Qbert Skratch University
Artistworks hired me to help bring QSU online, after their previous contractor failed to finish the work properly. This is their first Drupal-based video instruction site, and it has proven to be immensely popular.
It was originally based on Drupal 5, so I spent the majority of time working with that version. However, I was able to port the site to Drupal 6 before my contract expired.
All of the Artistworks sites use a custom-built video delivery platform, so it was necessary to integrate Drupal with an external database and an existing video UI.