Some resources that I have found useful for strategy, communication, and some other topics…

Change
Switch. How to change things when change is hard, Chip and Dan Heath
Made to stick: why some ideas survive and others die, Chip and Dan Heath (see also www.heathbrothers.com)
Nudge: Improving decisions about health, wealth and happiness, Thaler & Sunstein
Influence. The psychology of persuasion. R. Cialdini
Influencer. The power to change anything, Patterson & Grenny
Robin Hood Marketing, Katya Andreesen. Also see her blog

Animal rights and vegan strategy and communication
Change of heart, What psychology can teach us about social change, Nick Cooney
Veganomics, Nick Cooney
Strategic action for animals, Melanie Joy
The animal activist’s handbook, Matt Ball & Bruce Friedrich
Changing the Game, Norm Phelps
The videoblog of the Unnatural Vegan
The blog of Matt Ball (cofounder of Vegan Outreach)
The Animalist
The joyful vegan (Colleen Patrick-Goudreau)

Communication general
How to win friends and influence people, Dale Carnegie
Non violent communication, Marshall Rosenberg