Taken from an interview with a shaking crane master, full interview here: http://www.southerncranekungfu.com/content/?page_id=31
Chen: In your opinion, what are the fundamental features of Shaking White Crane?
Master YouXiang Lin: Firstly, I would like to mention its Jin (劲) or the internal martial energy. Shaking White Crane is also known as ZongHe in Fuzhou dialect. “Zong” means “to shake off”. In order to shake off your opponent, you need force.
The Jin in Shaking White Crane is a stream of powerful spring-like internal energy enabling you to shake off your opponent in the close range fight. When touched by this Shaking White Crane Jin, your opponent will have a feeling of being shocked by the lightening. Secondly, as a defensive southern style, White Crane highlights the defending techniques. Tradition has it that the white crane is an agile animal. If you splash a tub of water towards a crane, the crane will use its wings to flap off the water. No water will spatter and then wet the crane, not even a single drop. From this, people have drawn inspiration from the crane and have designed numerous fighting techniques through mimicking the movements of a crane. A White Crane practitioner should, like a real crane, leave no opportunity to the coming attack and avoid getting hurt.
There is some good video on this site as well.
It's Shotokan not Shoto-can't!!!