-Admit that you don’t understand the end user and rectify that

More to the point - be flexible and be prepared to define what you do by what your customers are interested in paying for.

-Remember to design for ease of use. Even advanced users like easy.

Not just easy to use - easy to understand. If it takes too long to explain the value of what you are offering no one will get it.

RE: 10 Tips for Moving From Programmer to Entrepreneur