You can download it, it is ready, right from the oven...

The best thing that I found there is the Validation Application Blocks, which is new and wasn't in the earlier versions.
"Developers can use this application block to create validation rules for business objects that can be used across different layers of their applications." (quoted form the msdn site).

You can find it here: http://msdn2.microsoft.com/en-us/library/aa480453.aspx

Enjoy...