On May 28th OpenGeo announced the release of the OpenGeo Suite. They also describe their open pricing structure for support of the suite.
This announcement represents a milestone for open-source geospatial software. If you are of a technical nature and are expecting a detailed discussion of the technical advantages of the OpenGeo Suite, you should probably stop reading now. The OpenGeo Suite is a milestone because it establishes a fair pricing model that addresses what, in my opinion, has been the primary barrier to the adoption of open-source GIS in many enterprises: risk.