I'm in the market for a good book that will teach me the fundamentals of QoS. The network I work with is 99% Cisco but it doesn't have to be Cisco-centric unless there's an argument to be made that it's an important consideration.
i was learning from this book
The SRND is excellent (and free).
http://www.cisco.com/en/US/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND/QoS-SRND-Book.html