Drupal is an Open Source CMS used to build stuff like Stubru.be, whitehouse.gov, base.be, and even multi-mania.be.

By combining a selection of the 7000 existing modules and allowing you to paint it with any kind of design. you're able to create a beautiful looking, performant and even complex websites. Drupal 7 has been released at the beginning of this year and during this presentation we will go over all the nice goodies which come with that.