Not sure if these count as textbooks by most peoples measures, but they have been textbooks for me.

[1]Overcoming the Five Dysfunctions of a Team

[2]The Wal-Mart Triumph: Inside the World’s #1 Company

[3]Guerilla Marketing

[4]The Lords of Strategy

[5]Influence: The Psychology of Persuasion

[6] The Four Obsessions of an Extraordinary Executive

[7]The Deming Management Method

[8]Creativity Inc.

[9]The Wisdom of Teams

[10]On Communication

[11]On Managing Yourself

[12]The Art of Facilitation

[13]Death by Meeting

[14]Good Business: Leadership, Flow, and the Making of Meaning

[15]Makers and Takers: The Rise of Finance and the Fall of American Business

1. https://www.amazon.com/Overcoming-Five-Dysfunctions-Team-Fac... 2. https://www.amazon.ca/Wal-Mart-Triumph-Inside-Worlds-Company... 3. https://www.amazon.com/Guerilla-Marketing-Inexpensive-Strate... 4. http://www.amazon.com/gp/product/1591397820?ref_=cm_sw_r_awd... 5. http://www.amazon.com/Influence-Psychology-Persuasion-Revise... 6. https://www.amazon.com/gp/product/B000079XXQ 7. http://www.amazon.com/Deming-Management-Method-Mary-Walton/d... 8. https://www.amazon.com/Creativity-Inc-Overcoming-Unseen-Insp... 9. https://www.amazon.com/The-Wisdom-Teams-High-Performance-Org... 10. https://www.amazon.com/Communication-featured-Necessary-Pers... 11. https://www.amazon.com/Managing-Yourself-Measure-Clayton-Chr... 12. https://www.amazon.com/Art-Facilitation-Essentials-Meetings-... 13. https://www.amazon.com/Death-Meeting-Leadership-Solving-Busi... 14. https://www.amazon.com/Good-Business-Leadership-Making-Meani... 15. https://www.amazon.com/Makers-Takers-Finance-American-Busine...

To answer #1, three books I would consider must-reads are:

Crossing the Chasm by Geoffrey Moore He discusses the Technology Adoption Lifecycle and hi-tech marketing. http://www.amazon.com/Crossing-Chasm-Geoffrey-Moore/dp/00605...

The Innovator's Dilemma by Clayton Christensen This Harvard business professor discusses what makes a disruptive innovation. http://www.amazon.com/Innovators-Dilemma-Revolutionary-Busin...

Guerrilla Marketing by Jay Levinson He discusses some scrappy techniques for promoting your businesses. Not all are applicable to web or hi-tech companies, but it can still spark some great ideas. http://www.amazon.com/Guerrilla-Marketing-4th-Inexpensive-St...