The non-open-source one I keep hearing about is Vertica (http://www.vertica.com/resources/videos/ http://www.vertica.com/resources/videos/), which was recently

The non-open-source one I keep hearing about is Vertica (http://www.vertica.com/resources/videos/ http://www.vertica.com/resources/videos/), which was recently acquired by HP and was founded by Mike Stonebraker (http://en.wikipedia.org/wiki/Michael_Stonebraker http://en.wikipedia.org/wiki/Michael_Stonebraker), the inventor of PostgreSQL.