ReWork is good, and here are a few others I'd recommend:

-->Little Bets by Peter Simms: Shows how small experiments can lead to breakthrough ideas.

-->The Lean Startup by Eric Ries: Details the systematic approach to building a successful business. Shows how an iterative, incremental approach can lead you to create winning solutions to customer problems. Ries focuses on experimentation to validate assumptions, and having data drive decisions.

-->Switch: How to Change Things When Change Is Hard by Chip Heath and Dan Heath: Whether we're trying to change our own behavior or others, this book is a great resource. As IT professionals, it's often necessary to change others' ways of thinking or doing things, and this book gets your feet wet in how to do that.

-->Made to Stick: Why Some Ideas Survive and Others Die by Chip Heath and Dan Heath: I truly think that copywriting--which is the art of pitching your ideas--is an essential business skill. "Made to Stick" is an engaging intro to how to create memorable, compelling messages.

Greg Miliates
StartMyConsultingBusiness dot com