Flickr Users Are Wrong by Tom Lee
The title is harsh, but this is a good summation of the issues involved in choosing a Creative Commons licence.
Open licensing is about giving up control so that other people can benefit. That’s all it will cost you: control. Having control feels nice. But you should ask yourself what it really gets you. And you should think about what others might gain if you were able to let go.
Think carefully and decide what you need. No one is going to make you tick that Creative Commons box. But when you do, it’s a promise.