Organizers of DrupalCon DC,  in the lead up to the event, asked Sun and the other event sponsors a few questions about their relationship with Drupal.  The first question was:

How does Sun work with Drupal?

I provided this answer:

There are too many ways in which Sun works with Drupal to list them all
here, but some of the highlights are:

• In 2005 Sun donated a
  server to drupal.org when scaling and performance problems were
  hampering growth
• Then in 2007 Sun donated
  another server to further propel the scale up of d.o
• Sun has used Drupal in building several important online
  communities:
• TED Prize winner Architecture for Humanity's Open Architecture Network
• Freshbrain - a technology
  exploration platform for youth
• the Open
  Office extensions site
• the Sun
  Learning eXchange
• Plus many organizations run Drupal on Sun technology
• Employees at Sun have been using Drupal internally for lots of
  things, including:
• as representative AMP stack environment and workload for lots
  of benchmarking and performance testing
• to demonstrate certain technologies, both in Sun internal
  training, and with Sun's customers, e.g., using the Webstack
  pre-built bundle of AMP and other open source packages for OpenSolaris,
  Virtualization with Solaris zones, MySQL installation and tuning, and
  PHP code analysis with DTrace.
• Sun has created a NetBeans
  plugin wizard for developing Drupal modules
• Sun is currently investigating system appliances for data archive
  and CMS that would bundle Drupal
• Of course, Sun is a large contributor to some of Drupal's most
  critical underlying open source technologies:
• MySQL AB is a Sun company
• many PostgreSQL core contributors are employed at Sun
• many PHP core contributors are employed at Sun
• Sun
  has contributed more FLOSS code than any other single
  institution\*. (Though, we think Solaris is technically a great
  choice for Drupal.)
• and let's not forget that Sun VP and inventor of Java, James Gosling, defended Drupal inventor
  Dries Buytart in his PhD examination at Ghent.

Clearly, Sun is deeply connected to the Drupal community in many ways.

All the Q&A from DrupalCon's sponsors will be posted here on the DrupalConDC site.

\* Entry corrected to say Sun
has contributed more FLOSS code than any other single
institution, not Sun has contributed more code to the Linux kernel than any other single institution (although I think I did read that somewhere, it's not substantiated in this paper).  Thanks to Matt for point that out - it's major difference.