Videos on lynda.com (see tomgeller.com for a free trial):
* Drupal 7 Advanced Training
* Create Your First Online Store with Drupal Commerce
* Drupal 7: Reporting and Visualizing Data
* Drupal 7 Essential Training
* Drupal Gardens Essential Training
* Drupal 7 New Features
* Drupal 6: Online Presentation of Data
* Drupal 6 Essential Training

Book:
* Drupal 7: Visual QuickStart Guide (Peachpit Press)

Marketing and other corporate materials:
* Commerce Guys
* Acquia

White papers:
* Migrating a Web Site to Drupal (Acquia)
* Build a Great Drupal Website with your new theme from TopNotchThemes
* How to make an Online Store look great with your new theme from TopNotchThemes
* Building an Enterprise-Class Web Site with Drupal and Mediacurrent
* Guide to Large-Scale Publishing with Drupal (Mediacurrent and Phase2 Technology)

Other stuff:
* Frequent bug filer
* Attend local DUGs occasionally
* Laughably minor contributions to documentation, core, and contrib