For us at 2bits.com, Drupal has always been, first and foremost, a web applications framework, that happens to have some 'out of the box' features that also make it a content management framework (CMF), and a content management system (CMS).
To restrict Drupal as only a social networking CMS is not giving Drupal credit for everything else it can do. From multimedia, ecommerce, stock and currency applications, and much much more.
As developers and consultants, we were always impressed with the ever improving API of Drupal, which is where the following features come from:
See what Robert Fabian of CIPS says about targeting Drupal mainly to developers. I am sure that many will not agree to this, since it is pigeonholing of another type, but it is certainly food for thought on where Drupal's strengths are.
Update Dec 15, 2007: Andre Molnar writes on his blog expanding on Robert Fabian's point of Drupal's community of developers are its greatest asset. Definitely worth reading.