On the Internet, it's survival of the easiest.... Give users a good experience and they're apt to turn into frequent and loyal customers. But ... it's easy to turn to another supplier in the face of even a minor hiccup. Only if a site is extremely easy to use will anybody bother staying around.
Jakob NielsenThroughout this book, we've been evangelizing simplicity, but ironically, the practice of simplicity is not simple. It is easy to build a bulky design by adding layer upon layer of navigation and features; it's much more difficult to create simple, graceful designs. Paring designs to essential elements while maintaining elegance and functionality requires courage and discipline.
Jakob Nielsen