Microsoft Patterns & Practices released the Validation Application Block Hands-on Labs earlier, and now they have released the hands-on labs for the rest of the Enterprise Library Application Blocks in 4.1 as well as Unity 1.2.
Per the download:
"Use this set of Hands-on Labs as a guide to learn about the application blocks included with Enterprise Library 4.1 and practice how to leverage their capabilities in various application contexts. It includes Caching, Cryptography, Data Access, Exception Handling, Interception, Logging, Security, Validation, and Unity Hands-on Labs."
There are also two entirely new hands-on labs covering Unity Interception and Dependency Injection. You can download the Hands-on Labs for the Unity Application Block 1.2 by themselves.
You can check out a few screencasts on using Enterprise Library 4.1 and Unity Application Block: