I often get questions at conferences about the new ASP.NET 2.0 security features including membership and role management. Also, in particular, I get questions about integrating ASP.NET 2.0 membership and role management with Active Directory.
There are a couple of resources that are available to help developers get the most out of these exciting new features. The first is available now: Professional ASP.NET 2.0 Security, Membership, and Role Managment by Stefan Schackow. Stefan is part of the Microsoft ASP.NET 2.0 team. He covers in depth all the security and user management functionality of ASP.NET 2.0, and how to build integrated secure sites with Windows Server 2003, Active Directory, LDAP, and SQL Server 2005. A sample chapter (Chapter 1 - Initial Phases of a Web Request) can be found here (PDF). The table of contents can be found here.
Another great resource to watch for is The .NET Developer's Guide to Directory Services Programming by Joe Kaplan and Ryan Dunn. Though not specifically for ASP.NET 2.0, if you are building integrated applications with Active Directory, LDAP, or other directory services, you can't be without this book. It is expected to be released in early May, 2006.