As announced on the Enterprise Library workspace home, the long wait is now over. You can download the Enterprise Library (aka EntLib) 1.0 from:
http://msdn.microsoft.com/library/en-us/dnpag2/html/entlib.asp
If you haven't already heard, Enterprise Library is basically the next generation of the Application Blocks concept from the Patterns & Practices group. Microsoft and Avanade focused on integrating what used to be isolated blocks into a consistent library of features which can be used, ignored or extended as necessary in your particular environment.
You should definitely take the time to download and look through what there is to offer in this release. The package includes all of the code (and unit tests!), so even if you don't plan on using the EntLib, you could certainly gain ideas from the documentation and code for your own implementations.
-Chris