"Enterprise Library is a major new release of the patterns & practices Application Blocks, which are reusable software components designed to assist developers with common enterprise development challenges. Enterprise Library 1.0 will bring together new releases of the most widely reusable blocks into a single integrated download."
This is pretty awesome, my former company actually had a hand in helping to get this done. Here is a little more about what it will include:
"The initial release of Enterprise Library will include Application Blocks that support the following scenarios: data access, exception handling, caching, configuration, logging, security and cryptography. In the future the library will be expanded to include additional Application Blocks that support a wider range of scenarios."