It's a mighty big market - the software as a service (SaaS) market hit $6.3 billion in sales last year, and Gartner Group believes the market will hit $19.3 billion by 2011. Typically used for CRM and HR functions, folks are now finding new uses for SaaS that can actually help with compliance, among other things.

Dave Sims wrote a good article on the topic over at Data Storage Today. It discusses the use of SaaS and what experts are saying. If you're struggling with compliance, read the Data Storage Today article.