Reporting Services Security

For anyone facing authentication or authorization errors in a Reporting Services environment, or just looking for some introductory material, I've posted two new articles to OdeToCode:

Introduction To Role-Based Security In SQL Server Reporting Services

Authentication, Role-based Security, and Reporting Services Web Services

If you give them a read, please let me know if you think they are easy to understand, and please let me know if they contain any errors.