Disclaimer The opinions expressed herein are my own personal opinions and do not represent my employer's view in anyway.
(IOC) Inversion of Control
http://www.martinfowler.com/articles/injection.html
Reduce dependency
http://weblogs.asp.net/sfeldman/archive/2008/02/14/understanding-ioc-container.aspx
http://weblogs.asp.net/sfeldman/archive/2008/02/20/understanding-ioc-container-part-2.aspx