sqlcat.com has a great serie about Deploying Large Scale SQL Server Reporting Services Environments. This article is a introduction to this serie. It provides general guidance on how to set up, implement, and optimize an enterprise scale-out architecture for your SQL Server Reporting Services (SSRS) environment. This note provides guidance for both SQL Server 2005 and 2008 Reporting Services. The focus of this technical note is the Reporting Services scale-out architecture, which is referenced throughout this technical note series.
Read the article here.