Five years ago, software as a service (SaaS) was a curiosity of the CRM market, aimed mostly at small businesses. Today a panoply of providers offer service-based versions of just about any enterprise application to businesses of all sizes.
And the service delivery model shows no signs of slowing. Gartner estimates that by 2011, a quarter of new business software will be delivered as a service.
Source: Information Week, http://www.informationweek.com