Alfresco recently released some information about its enterprise content management system user base. This study was picked up in several articles including eWeek. It shows a strong Red Hat presence in these Alfresco enterprise deployments and user base.
One of the most interesting tidbits of news was the fact that JBoss Portal had a strong lead in deployments using a Portal with 51% share. Liferay was a distant second at 32% and closed source Portals could only garner 17% share collectively! Looks like another market moving to open source!