OK so while writing my book, I somewhat wished i had an easy way of defining the expiration "policies" via configuration while creating my samples for the Caching Application Block for Enterprise Library. This drove me to creating the the Caching Expiration...

If anyone gets anything out of what I have been preaching about Enterprise Library, is that it is Extensible. If it does not have a feature that comes out of the box; look at the source code, look on codeplex.com, find other online and offline sources...