Song Lists for Seeker Driven Congregations

How do you plan the worship in your services that are specifically targeted toward non-Christians?  Have you found any songs that everybody will join in on, whether they know it or not?  Have you found songs that really minister and penetrate the hearts of people who are seeking God, but have not yet found Him?  If you have a seeker driven worship style, give us a window into what your worship service looks like, and what kind of songs you are singing.