Microsoft Patterns & Practices Ent Lib 3.1 can be downloaded from the link below.
http://msdn2.microsoft.com/en-us/library/aa480453.aspx
These blocks are very useful and efficient.
I tried to find step-by-step hands on tutorial for this version but was able to get only for version 2.0.
I created 6 PDF documents and here they are. If you have url for 3.1 tutorial please pass it on.
(Right click and Save As)
Lab-1-Data Access Block
Lab-2-Caching-Block
Lab-3-LoggingApplication-Block.pdf
Lab-4-Exception-Handling-Block.pdf
Lab-5-Cryptography-Block.pdf
Lab-6-Security-Block.pdf