Unrestricted Warfare was written by two Chinese Colonels in 1999. The CIA translated the text and its been an ongoing area of concerned discussion ever since.

URW doctrine is a means by which a weaker opponent can defeat a stronger opponent through widely distributed attacks across multiple domains (i.e., computer networks, communications, financial markets, media, terrorist acts) and without abiding by any commonly-held rules of engagement.

There have been two symposiums held so far on URW, both organized by Johns Hopkins University Applied Physics Lab and sponsored in part by DARPA and the National Intelligence Council, among others. Here are the links to the original book, as well as the papers presented at each symposium.

Unrestriced Warfare by Qiao Liang and Wang Xiangsui
Unrestricted Warfare Symposium Proceedings 2006
Unrestricted Warfare Symposium Proceedings 2007

I also wrote a post at IntelFusion today with a few comments by two leading analysts on URW and it's impact on analysis within the U.S. Intelligence Community.