I had a great time on my hour-long interview with Chris Walker, aka, The Evangelism Coach, last Thursday.
If you weren't able to listen to it live, you can listen to the interview by clicking on the link below and from there clicking on the BlogTalk Radio file.
http://www.evangelismcoach.org/2009/how-to-get-church-visitor-contact-information/
While you are there, take some time and look around Chris' website—he has quite a few great resources for evangelism.
He has also written a book on How to Welcome Church Visitors, that has lots of helpful tips in it.