... someone has to be using it. Guys from 37signals got it right:

It feels great to be done with something on the programming side and then feeling free to move on to the next thing. We all do that at times. But it’s not really real until our users are able to enjoy it.

Way too often more attention is paid to the process of creating something than to the actual value of the result for others. The truth is that value is realized not at the moment the product is created and the more so not in the process of creation. Value is realized when the product is delivered and used.

Declaration of Interdependence which is going (hopefully) to drive the way we manage projects puts essential focus on delivery of value:

We increase return on investment by making continuous flow of value our focus

Like quality is everyone's business every day, so delivery of value should be.