The Linux Foundation had similar requirements to other developer networks. They wanted to be able to connect their developers in such a way that they could communicate efficiently, while also retaining communications to be searched and archived as a knowledgebase. They had an existing mailing list that they wanted to integrate with a new forum feature on the site. Drupal handles this effectively, and we were able to sync up comments and replies on both pieces of technology so they talked to each other. It was a neat way to allow people who want to stay on the email list to just manage it on the email list, and allow those who wanted to interact with a forum handle it that way.
They also managed single sign and other features that allowed them to be integrated with other technologies they were already working with, and made it seamless for people who were already using their main homepage to integrate into the developer network.
No, I never met Linus. Still a fun project though.