Microsoft has released Microsoft Application Request Routing Version 2.5 for IIS 7
Download for 32-bit
Microsoft Application Request Routing (ARR) for IIS7 is a proxy based routing module that forwards HTTP requests to application servers based on HTTP headers and server variables, and load balance algorithms. ARR Version 2.5 improves the performance and scalability of disk caching features in ARR.Download for 64-bit
Download for 32-bit