One of the first questions I am asked when I start talking about Drupal is "Who uses this system anyway"?
It is an excellent question, and one that has an equally excellent answer.
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A more in depth look at a large number of Druapl based sites can be found on the website of Dries Buytaert, creator of Drupal.
With its powerful tools, huge selection of modules and proven track record, I believe that Drupal is a great fit for just about any website out there. It is no longer necessary to be satisfied with a static brochure site when a tool like Drupal enables you to communicate with your customers, sell products and build a community all from your website.