Here's a linik to some useful information. What it purports is open to conjecture.
http://inteldaily.com/2011/07/norway-bombing-and-shootin/?utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+inteldaily%2Ffeeds+%28Inteldaily.com%29&utm_content=Yahoo!+Mail
While Breivik is being blamed for this it is important that we remember that a jihadi organization, be it a real one (if there are any) or a Western psy-op, took credit for the attacks.
The latest speculation is that he is a conservative angry with his government's "liberal" immigration policies. This makes sense vis-a-vis the building bombing, but renders the shootings more than a little anachronistic.
The important thing to remember is that we are getting faulty information from well-meaning sources, and from disinformationists who may not be responsible for the incident but will try to spin it to their favor. Caveat emptor.