"Simplicity is prerequisite for reliability" 

is a great line from the article that's still accurate. Small (simple) changes reduce the risk of using continuous deployment. Code should be modular and decoupled.

There's a great section on simplicity in code in Stuart Halloway's talk from QCon SF last year: http://qconsf.com/dl/qcon-sanfran-2010/slides/StuartHalloway...