Some quick notes on integrating SSRS with MOSS. Using Sql 2005 SP2.
1. Configure Report Services BEFORE installing the add-in.
2. Must use the Reporting Services Configuration tool in Sql to configure the virtual directory. DO NOT use IIS.
3. If don't see the Reporting Services section in CA after installing the add-in, check and see if the Reporting Services site collection feature is enabled in the CA. Must login as a site collection admin for the CA to see this section.