There's nothing more exciting than leading someone to Christ through a "power encounter" hosted by the Holy Spirit. I've seen a waitress come to Christ because a group of us out for lunch simply showed Christ's love and talked to her and gave her words of knowledge-even one about her cat! I've also experienced times in which the Spirit of God is so tangible during ministry or a personal interaction that people have asked me, "What is this, and how do I come to know this Jesus you are talking about?"
When Jesus spoke brief words of knowledge to the woman in Samaria, she told the entire village about the Lord. I believe these types of power encounters have been God's preference for evangelism all along. Other methods have some impact, but nothing gets your attention like finding out that God "has your number."