in no particular order:
Myers-Brigs Model for Personality
"Four Steps to the Epiphany" by Steve Blank
John Boyd's OODA Loop as a model for competitive decision making
Decision Analysis techniques: in particular decision trees, expected value of perfect information, and good decision bad outcome
BATNA (best alternative to a negotiated agreement) concept for negotiation planning
"Secrets of Consulting" by Gerald M. Weinberg
"Bionomics" by Michael Rothschild
SimCity computer game
Analysis of Competing Hypotheses methodology
wiki (social process) model for small team collaborative document development
community of practice model for knowledge management
"The Moon is a Harsh Mistress" by Robert Heinlein (in particular TANSTAAFL)
activation energy, catalyst, and phase change concepts from physics/chemistry
Amplify Positive Deviance model from Jerry Sternin (Save the Children)
"The Empowered Manager" by Peter Block, in particular his trust vs. agreement matrix
"Crossing the Chasm" & "Inside the Tornado" by Geoffrey Moore
"Maneuver Warfare Handbook" by William Lind
"Change Your Brain, Change Your Life" by Daniel Amen
"Micromotives and Macrobehavior" by Thomas Schelling
Appreciative Inquiry Techniques