This article by Dr. Lewis A. Parks  (Professor of Theology, Ministry and Congregational Development at Wesley Theological Seminary, who has done extensive work with small membership churches and their leaders) is a helpful start to thinking about how we can make our church more sensitive, and responsive, to the needs of our visitors.

http://www.churchleadership.com/leadingideas/leaddocs/2008/240908_article.html

As the article concludes, in addition to being sensitive and responsive to these five types of visitors, we must pay careful attention to the two issues that will influence whether the visitor will actually choose to make his or her home in our church - our practice of radical (read Biblical) hospitality and excellence in ministry programming and execution.