Microsoft just released our first Community Technology Preview release of Enterprise Library 3.0 to our new CodePlex site:
http://www.codeplex.com/entlib

Full release notes are installed with the MSI, but hereÔÇÖs a quick summary of the changes.

Core
Source Code installer
Partial Trust Support
Strong-Named Binary Assemblies
Validation Application Block

Core validation API
Minimal Validator Library
Attaching validators to objects via attributes
Attaching validators to objects via configuration
Not included yet (but in the works): Configuration tool support, complete validator library, integration with ASP.NET, Windows Forms, WCF etc.

Data Access Application Block
SQL Server Compact Edition Support
New Database.UpdateDatabase overload with updateBatchSize parameter

Configuration Tool
Visual Studio IDE integration
AppSettings support
Encryption support

Application Block Software Factory
Templates and recipes for creating application blocks and provider libraries
Preliminary documentation

Strong Naming Guidance Package
Recipes to assist in strong-naming and updating [InternalsVisibleTo] across multiple projects

Please take a look, tell your friends, and provide feedback on the CodePlex site. Enjoy, and have a great holiday.