The open source edu.yale.som.auth .NET solution:

Combines different authentication and authorization providers, e.g. Yale University Central Authentication Service (CAS), Forms Based Authentication (FBA) and Active Directory (AD) into a single login page for SharePoint 2007 (MOSS) and ASP.NET web sites.
Integrates MOSS or standard ASP.NET web applications with a CAS authentication method implementation to allow users to authenticate via CAS and authorize against FBA Roles.
Exposes a consistent login experience for users across all your MOSS and ASP.NET web applications
Can display multiple authentication methods or can be configured to always default to a single method, e.g. CAS.
Utilizes a plug in interface design that allows you to implement additional authentication and authorization classes to extend the login functionality.
Provides user processing for FBA Membership, Profile and Roles dynamically during login and/or through batch process via custom FBA administration web parts.
Allows you to map your existing AD group memberships to FBA Roles for authorization against those Roles in MOSS or standard ASP.NET web applications
Simplifies MOSS site design, deployment and management by allowing you to expose multiple authentication and authorization methods in a single MOSS web site Zone.

Download:

The source for the entire edu.yale.som.auth Visual Studio solution is available at http://www.codeplex.com/eduyalesomauth

Brendan Kennedy Turnbull
Technical Lead / Systems Programmer II
Information Technology Research & Development
Yale University, School of Management