Configuration Manager–Configuring SQL Reporting Services (SRS)
From the archive (2011). Written for the tools of the time, so some details may be out of date.
Here is a great step by step for configuring and setting up SRS with ConfigMgr:
http://blogs.technet.com/b/mwiles/archive/2009/02/19/east-setup-of-srs-with-config-manager-r2.aspx
Here is a great article that details setting up the required permissions for SRS:
Here is the SRS tag on Steve Thompson’s blog, lots of great posts here:
http://myitforum.com/cs2/blogs/sthompson/archive/tags/SSRS/default.aspx