Her's a list to get your juices flowing. Feel free to add your own recommendations as a comment contribution.
* First Contact by Sam Hunter
* Beyond The Obvious by Phil McKenny
* 4 Hour Work Week by Timothy Ferris
* Rework by Jason Fried
* Right Ways to Respond When Things Go Wrong By Jim Moorhead
* Taking People with You ... The Only Way to Make Big Things Happen By David Novak
* How Companies Win ... Profiting from Demand-Driven Business Models No Matter What Business You're in By Rick Kash, David Calhoun
This question is much more than just giving a list of the top three books you should read, their title, author, and a short synopsis.
When you are a budding entrepreneur you not only have to know sales, marketing, and your product, but how to start thinking out of the box in order to set yourself apart from your competition who typically have more experience and resources you do.
I would agree with starting with the 4 Hour Workweek for streamlining and understanding productivity.
Then hop to The Tipping Point and the Outliers by Malcolm Gladwell for a little lesson on economics, emerging trends, and successful people.
Knowing how to make a deal and negotiate is pretty important for every entrepreneur so pick up the book, Negotiate to Win for a crash course in making deals.
If you want to meet people that are going to open doors for you networking is key ... so get your 1 on 1 course with the little Black Book of Connections by Jefferey Gittomer.
Finally, once you start your company and you are making a little money you are going to need employees. Then you will need to know how to manage, motivate, and retain your employees. Read First Break All the Rules for a management lesson that will blow your mind.
I know this is long, but it is paramount to know that you need multiple platforms of knowledge to be a successful entrepreneur