FYI,
MITRE, a nonprofit think tank catering to the US Department of Defense
(DoD), wrote an interesting study about the use of FOSS in the US Military.
PostgreSQL is not mentioned, but MySQL is. Seems to be an interesting
relaxation trend in the DoD, for those of us who do this kind of work.
http://www.egovos.org/rawmedia_repository/588347ad_c97c_48b9_a63d_821cb0e8422d?/document.pdf
Rick