I just wrapped up my most recent project—a rebuild for Action Against Hunger (ACF USA)—and it was one of the most satisfying projects I've done in a long time. I was really excited for the chance to build a Drupal 7 site, but during the discovery process of the project, we tried our best to talk them out of it. We were concerned that too many modules wouldn't be ready for prime time, and that they'd have to compromise too much on functionality. And here's where the project got really interesting. Basically, we decided to cleanse their site with the fire of Drupal 7.