Hello Drupes,
BZ just made the full switch to Drupal. Before yesterday, I was using an integration bridge between Vanilla and Drupal. And before that, an integration bridge between vBulletin (shudder) and Drupal. Now I'm using Drupal 100% thanks to the advanced forum module.. (wish I would have found that before doing the vanilla integration)
BZ used to be a fan-site for the metalcore band Zao, but my personal interest in the band has decreased a lot.. and instead of killing the small community I had, I decided to turn it into something more. Drupal was perfect for what I needed, and now I have a completely customized site with (at the moment) a band / album / music database, and forums.
All together, BZ took me probably a total of two months to achieve where it's at now, but I started out a "n00b" and am now pretty educated with Drupal.
Anyways, the theme is 100% custom. I did take a few items from hunchbaque's template.php, and I integrated the Blueprint CSS framework to follow the grid type layout.
Almost everything was done with CCK and Views, although I do have quite the collection of modules installed.