We've been using 2ndQuadrant for a few years and love working with them: http://2ndquadrant.com/en/support/support-postgresql/

They are mentioned in original PDF on page 7 http://www.postgresql.org/message-id/attachment/43080/Postgr.... Mentioned as a company and a product, that has lots of add ons on top of PostgreSQL for reliability, distributed computing and operability.