I've found the following online resource links helpful in working with ConfigMgr 2007 SQL Server Reporting Services.
SQL Server 2005
http://msdn.microsoft.com/en-us/library/ms159106(SQL.90).aspx
Reporting Services MSDN – SQL Server 2008
http://msdn.microsoft.com/en-us/library/ms159106.aspx
For self study, these are hard to beat.
http://www.simple-talk.com/sql/learn-sql-server/beginning-sql-server-2005-reporting-services-part-1/
http://www.simple-talk.com/sql/learn-sql-server/beginning-sql-server-2005-reporting-services-part-2/
http://www.simple-talk.com/sql/sql-server-2005/business-intelligence-in-sql-server-2005,-part-1/
http://www.simple-talk.com/sql/sql-server-2005/advanced-matrix-reporting-techniques/