Great series of Separation of Concern by Jimmy Bogard

I just finished reading Jimmy Bogard's 5 series of Separation of Concern by example and they are just too awesome to be missed out.

The series :
# Separation of Concerns - how not to do it
# Separation of Concerns by example: Part 1 - Refactoring away from static class
# Separation of Concerns by example: Part 2 - Specialized interface for Cache
# Separation of Concerns by example: Part 3 - Creating the repository
# Separation of Concerns by example: Part 4 - Fixing a bug with unit test
# Separation of Concerns by example: Part 5 - Dependency Injection with StructureMap

The best thing that I like about them is that they are based on a real world example :D
Enuf said, go and see for your self ;)