I read Warren's book a few years back and it had some good tips in it. I may read through it again. It's been sitting on my shelf for quite a while.
The book is amazing. During a physical therapy session a couple of weeks ago I was rereading "Christianity With Power" by Kraft and the therapist wanted to know what it was about. I told her and she asked me if I had ever heard of "Purpose Driven something". She said reading it had changed her friends life. I told her I would bring her a copy at the next session. I gave it to her and she read the introduction and the first couple of chapters during the therapy session. When I called the next day to schedule the next session, she said she was looking for a church and reading the book.
It is an amazing introduction to Christ and His church and from my experience makes readers hungry and thirsty for more.