You can now download the Beta 2 releases of EntLib 5 and Unity 2 from Microsoft Patterns & Practices. Lots of bug fixes as well as the integration of the Enterprise Library 5 Configuration Editor in Visual Studio 2008.
The ability to configure Unity in the EntLib 5 Configuration Editor has been temporarily removed and won't be available until after the release of Enterprise Library to meet the proposed release deadline.
You can view some Enterprise Library 5 Tutorials and Unity 2 Tutorials as well as download the beta 2 releases of EntLib 5 ( here ) and Unity 2 ( here ).
Patterns & Practices Guidance