Andy Hertzfeld (one of the programmers on the original Macintosh) has this story on shipping:
On the one hand, I agree with the statement that 'good enough is the enemy of best' while, on the other hand, I have first-hand experience of personal projects that were delayed by up to a year because there was always something that could be improved, or tested better or looked better. Discipline is necessary.
On a final note, it may have been in Steve's column where I read the[font="Verdana"][/font] comment that people don't remember missed features but they do remember missed shipping dates.