Drupal is a very flexible CMS which can be extended to provide the functionality needed for may different types of website.
I've worked on a few projects where I was brought in for my Drupal expertise, but in the end felt that Drupal wasn't a good solution in these particular circumstances. So I've been pondering what sorts of projects is Drupal best suited to.
editors to add information about new projects, partnerships, news and so on. These elements are automatically cross-referenced and appropriate articles highlighted on the home page.