I read a fair bit.  Below are lists of the books I'm reading right now, books I recently finished, as well as some of my all-time favorites.

Books I'm currently reading

Meditations: A New Translation
Performance Modeling and Design of Computer Systems: Queueing Theory in Action
Lean Enterprise: How High Performance Organizations Innovate at Scale
The Big Sleep

Books I've Read Recently

Stalin: Volume I: Paradoxes of Power, 1878-1928
High Output Management
Beacon 23: The Complete Novel
The Rosie Project
Den of Thieves
Business Adventures
Oil: A Beginner's Guide
Fuzzy Nation
The Martian

My favorite books ON management.

The Hard Thing About Hard Things: Building a Business When There Are No Easy Answers
Conspiracy of Fools: A True Story
Good Strategy Bad Strategy: The Difference and Why It Matters
The Mythical Man-Month: Essays on Software Engineering
Quiet: The Power of Introverts in a World That Can't Stop Talking
Peopleware: Productive Projects and Teams
Good to Great: Why Some Companies Make the Leap... and Others Don't
Stalin: Volume I: Paradoxes of Power, 1878-1928
The Three Signs of a Miserable Job: A Management Fable About Helping Employees Find Fulfillment in Their Work

My favorite books ON entrepreneurship

Venture Deals: Be Smarter Than Your Lawyer and Venture Capitalist
The Hard Thing About Hard Things: Building a Business When There Are No Easy Answers
Crossing the Chasm: Marketing and Selling High-Tech Products to Mainstream Customers
The Startup Owner's Manual: The Step-By-Step Guide for Building a Great Company
The Innovator's Dilemma: The Revolutionary Book That Will Change the Way You Do Business
Moneyball: The Art of Winning an Unfair Game
The Founder's Dilemmas: Anticipating and Avoiding the Pitfalls That Can Sink a Startup
Innovation and Entrepreneurship: Practice and Principles
Managing the Unmanageable: Rules, Tools, and Insights for Managing Software People and Teams

My favorite books ON Marketing

Influence: The Psychology of Persuasion
Crossing the Chasm: Marketing and Selling High-Tech Products to Mainstream Customers
Confessions of an Advertising Man
Hey, Whipple, Squeeze This: A Guide to Creating Great Ads
New Products Management
Designing Brand Identity: An Essential Guide for the Entire Branding Team
Made to Stick: Why Some Ideas Survive and Others Die
The 22 Immutable Laws of Marketing: Violate Them at Your Own Risk
Why We Buy: The Science of Shopping

My favorite books on Poker

The Mathematics of Poker
Winning Poker Tournaments One Hand at a Time, Volume I
Winning in Tough Hold 'em Games: Short-Handed and High-Stakes Concepts and Theory for Limit Hold 'em
The Raiser's Edge: Tournament-Poker Strategies for Today's Aggressive Game
How Good is Your Pot-Limit Omaha?
Omaha Holdem Poker
Let There Be Range!: Crushing SSNL/MSNL No-Limit Holdem Games
One of a Kind: The Rise and Fall of Stuey, 'The Kid', Ungar, The World's Greatest Poker Player
Winning Poker Tournaments One Hand at a Time, Volume II