I know, sounds boring to most people, but for enterprise developers, this is cool stuff. In case you care, and didn't know, the latest release of Enterprise Library has been released.
Microsoft patterns & practices is excited to announce the latest addition to
the p&p library of software architecture guidance:
Enterprise Library 4.1
October 2008 Release
– MSDN site: http://msdn.microsoft.com/entlib
– Community Forum: http://go.microsoft.com/fwlink/?LinkID=119312
– Community Extensions: http://codeplex.com/entlibcontrib
Enterprise Library is a collection of reusable software components (application blocks) designed to assist software developers with common enterprise development challenges (such as logging, validation, caching, exception handling, and many others). Application blocks are a type of guidance encapsulating Microsoft recommended development practices; they are provided as source code, tests plus documentation that can be used "as is," extended, or modified by developers to use on complex, enterprise-level line-of-business development projects.
I haven't had a chance to try it out yet, but wanted to pass it along.