This is a good overview of all aspects of both application acceleration and WAN optimization. Published by Cisco and general enough for anyone interested in learning more about this specialized area of network. This book is a survey of the challenges and general (not Cisco specific) solutions to application performance and WAN optimization (bandwidth optimization) with enough detail to fully understand the subjects, without going into formulas and algorithms.
Wikipedia is always a good resource for information. This is the main page on the topic of WAN optimization covering both WAN and bandwidth optimization techniques. It doesn’t discuss the topic of TCP Acceleration but this alternative page does.