Authorization and Profile Application Block Released for .NET

The Authorization and Profile Application Block provides you with an infrastructure for role-based authorization and access to profile information. The block allows you to:
? Authorize a user of an application or system.
? Use multiple authorization storage providers.
? Plug in business rules for action validation.
? Map multiple identities to a single user.
? Access profile information that can be stored in multiple profile stores.

http://www.microsoft.com/downloads/details.aspx?familyid=ba983ad5-e74f-4be9-b146-9d2d2c6f8e81&displaylang=en