Greg McKeown’s The Disciplined Pursuit of Less is an article about careers, but his solid advice also applies to software product development:

If success is a catalyst for failure because it leads to the “undisciplined pursuit of more,” then one simple antidote is the disciplined pursuit of less. Not just haphazardly saying no, but purposefully, deliberately, and strategically eliminating the nonessentials. Not just once a year as part of a planning meeting, but constantly reducing, focusing and simplifying. Not just getting rid of the obvious time wasters, but being willing to cut out really terrific opportunities as well. Few appear to have the courage to live this principle, which may be why it differentiates successful people and organizations from the very successful ones.