Multiple instances of SSRS
I was asked the other day, is it possible to have multiple SSRS instances on the same server?
The answer is yes, you can install another instance of SQL Server and then install whatever components that you want on that instance and SSRS is one of those non-shared components.
This is useful if you want to host different content for specific sites. Each instance will have its own report server database, configuration files, and virtual directories.
See the following link.