A snippet from Microsoft Site:
System Center Virtual Machine Manager Self-Service Portal 2.0 is a free, partner-extensible solution that allows you to dynamically pool, allocate, and manage datacenter resources. Using the Self-Service Portal, you can reduce IT costs, while increasing agility for your organization. The Self-Service Portal works with products and technologies you know and trust, like Windows Server and the System Center product suite. This solution delivers:
Automated web portals and workload provisioning engine that’s integrated with System Center.
Tested guidance and best practices to help configure and deploy private cloud infrastructures.
Guidance to help partners easily extend functionality.