Inside Hackers Seen as $40bn Threat for US Employers

Of course, this isn't new. Insiders have been threats since day 0. The question is, "what to do about it?"

As start, here are some articles and books that shed light on solutions.

Articles
The Insider Threat: A View from the Outside
Fundamental Elements of Computer Fraud
Protecting Customer Privacy Information


Books
Managing the Insider Threat: No Dark Corners
Insider Computer Fraud: An In-depth Framework for Detecting and Defending against Insider IT Attacks