Non-profit
Electronic Frontier Foundation using Drupal
The main website of the Electronic Frontier Foundation (EFF) relaunched using Drupal. The EFF is a non-profit organization with the stated purpose of being dedicated to preserving free speech rights.
According to Tim Jones, who helped with the implementation, the most interesting bit is the file-management. The EFF has thousands of PDFs spanning 15 years of legal cases to archive and organize. In the old site, these were just flat HTML links, so a big reason for the move to Drupal was to build a document management system. You can see it best on document-heavy pages like the AT&T case.
Greenpeace using Drupal
The new Greenpeace UK website relaunched using Drupal today. Check it out at http://www.greenpeace.org.uk or read up on some background information. Looks beautiful!
OSI using Drupal
The Open Source Initiative (OSI) is using Drupal for their official website at http://opensource.org.
Danese Cooper recently announced the redesign at the OSI board blog. Eric Raymond, former president of the Open Source Initiative and author of the The Cathedral and the Bazaar is blogging there as well.