This article has changed my training the most: http://trainingdimensions.net/SOS/SOS%202007/Grease%20the%20Groove%20for%20Strength.pdfI have never applied it 100 %, but I took everything I liked about it and forgot about the rest. It's simple, but oh so effective approach. And it's not even a program, it's a philosophy.
One of the best resources on the net for training bar none!http://strengthcoach.com/Nutrition - www.johnberardi.com