Salesforce.com, the preeminent SaaS (software as a service) company, is reportedly joining the open source OpenStack project. The Wall Street Journal quotes Graham Weston, co-founder and chairman of Rackspace, which is one of the original OpenStack companies, to report the news. The move would be a major endorsement of the open source platform by yet another major technology company. Salesforce.com would join the ranks of Cisco, IBM, Intel, Red Hat, Dell, HP and dozens of others who have thrown support behind the open source infrastructure as a service (IaaS) project.