J.D. Meier and team have been busy creating the ASP.NET 2.0 Security FAQ: an easy to use Q&A format entry-point to the broader ASP.NET security guidance. It is in Wiki form so you can easily read, comment, update, and contribute. Find all the great content at: http://channel9.msdn.com/wiki/default.aspx/SecurityWiki.ASPNET2SecurityFAQs -- (example questions/answers: how to use forms authentication with Active Directory, how to create custom trust levels, how to implement single-sign on, etc).
This is a must see for everyone building applications using ASP.NET.