Enterprise Library for .NET Framework 2.0 is now available. It includes the Caching Application Block, Cryptography Application Block, Data Access Appliation Block, Exception Handling Application Block, Logging Application Block and Security Application Block. Definitely worth checking out.

From the website:

The patterns & practices Enterprise Library is a library of application blocks designed to assist developers with common enterprise development challenges. Application blocks are a type of guidance, provided as source code that can be used “as is,” extended, or modified by developers to use on enterprise development projects. This release of Enterprise Library provides similar functionality to the previous releases for the .NET Framework 1.1; however, Enterprise Library has been redesigned to use the new capabilities of the .NET Framework 2.0.