For the past couple of weeks, I've been working on a series of articles on building a scale-out SQL Server 2008 R2 Reporting Services Farm. Part 1 of this series is already available on MSSQLTips.com. This was inspired by the SQL Server 2008 Failover Cluster installation series as I've been searching for available guides online but was frustrated for not finding a lot of information (or maybe I just wasn't looking hard enough).
Enjoy!