Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
The business world is certainly starting to notice Drupal, as evidenced by this article in Businessweek naming Dries as a top 30-and-under innovator for 2008.
Businessweek talks about Drupal and Acquia, and mentions many of the great sites that have been built in Drupal. They cite the number of businesses using Drupal at being around 250,000.