Best practices documents are great. They give us guidelines that help us reduce the amount of time we might waste doing lots of things. Here in the digital space we've got best practices for just about everything from email to UX design.
As the newest Ditto to the team, I've spent the last two weeks learning a great deal about how things work here at EchoDitto. Tyler recently posted a pretty exhaustive report of the EchoDitto culture, if you want to catch up on that.
Here at EchoDitto, we've been making heavy use of the Display Suite module. It obliterates a lot of the more tedious theming issues we typically run into when building out a Drupal site, and for the most part, we love it.