IP QoS: Two generations of class-of-service tools
My IP QoS: Two generations of class-of-service tools article published by SearchTelecom gives you a very high-level overview of IntServ and DiffServ approaches to IP QoS as well as brief description of various DiffServ tools.
More to explore:
Excellent article. Just in those few paragraphs, the article changed some of the major ways I look at QoS.
Looking forward to the followup article.