Drupal is a kick-ass CMS, which can be used in too many ways to mention.

I am using it here as a blog and a wiki.

Why is Drupal so good? Because it is clean, and flexible. The code is a dream to read, and once you get inside the head of the developers you can do anything. It is a developers CMS, not a users CMS. So, if you want a site built, give Drupal to a developer, get back your site that does what you want, and then run it yourself.

I also do freelance Drupal development (funny that).