Resources here focus, generally, on strategic and operational planning. For fund development planning, check the Fund Development list.
Switch: How to Change Things When Change is Hard, Dan and Chip Heath
Designful Thinking, Marty Neumier
Strategic Fund Development: Building Profitable Relationships That Last, 3rd edition, Simone P. Joyaux ACFRE.
An entire lengthy chapter on institutional strategic planning. Includes lots of examples: focus group questions, surveys for planning, and sample plans. John Wiley & Sons published this new edition in 2011. Great appendices are posted on the book's website.
Strategy as Revolution, Gary Hamel, Harvard Business Review
The Living Company, Arie De Geus, Harvard Business Review