The growth in the SaaS market has largely been around the bigger SaaS guys getting bigger while the remainder of the SaaS providers are still struggling a bit. The analysts don't like to point this out because it makes the market look a bit monopolistic and less interesting, but that's the way it is... What will change this situation over time is need and acceptance. As SaaS gains acceptance in the enterprise, the smaller players can exploit niche applications...
What's different from SaaS is that a virtual appliance can also be deployed on premises for customers that need local access to the running application. Many like this option, I'm finding, such as large corporations that have security requirements that a third-party hosting model does not meet. The underlying virtualization technology also allows for rapid movement of virtual appliance instances between physical execution environments. That's the core difference you need to consider in any compa
What Salesforce.com has done is extend its reach from applications on-demand to platform-on demand, meaning you can leverage existing applications, processes and services as well as a platform hosted by Salesforce for development, integration, database and user interface design and deployment, all on a subscription-based platform... Clearly, Salesforce.com will have the largest impact of any vendor in the emerging platform-on-demand space.
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