Software as a Service (SaaS) has many benefits for enterprises, including lower capital costs vs. deploying enterprise software, faster feature upgrades, and fewer operational burdens. But SaaS is not free of problems or risks, as a panel of SaaS-savvy CIOs can testify. Integration of on-premises software and SaaS applications, integration with partners, responsibility for security, managing multiple SaaS vendors and evolving SaaS standards are just some of the challenges raised by CIOs speaking at SaaScon 2010, a two-day conference held this week in Santa Clara, California.