IIS7: Application Request Routing
Microsoft Application Request Routing (ARR) Version 1 for IIS 7 has been released. ARR enables Web server administrators and hosting providers and to increase Web application reliability and scalability through rule-based routing and load balancing of HTTP server requests. With ARR, administrators can optimize resource utilization for application servers to reduce management costs for Web farms and shared hosting environments.
For more information and for download link please visit homepage of the product on IIS.net: