HOW TO: Implement Role-Based Authorization with Forms Authentication

HOW TO: Implement Role-Based Security with Forms-Based Authentication in Your ASP.NET Application by Using Visual C# .NET (Microsoft Knowledge Base Article) - presents a simple example on implementing role-based security with forms authentication.
HOW TO: Implement Role-Based Security with Forms-Based Authentication in Your ASP.NET Application by Using Visual Basic .NET (Microsoft Knowledge Base Article)
Role-Based Authorization with Forms Authentication by Darren Neimke and Scott Mitchell (4GuysFromRolla.com) - uses a database to store user role information.
How To: Create GenericPrincipal Objects with Forms Authentication (MSDN) - this approach stores the role information retrieved from a data source in an encrypted cookie, therefore avoiding the need to hit the data source on every authentication request event.
Role-Based Security with Forms Authentication by Heath Stewart (CodeProject) - similiar to the above.