What's A Healthy Church?

I'm just curious. As a pastor I get to talk to a lot of different people about "church," and I get to talk with a lot of people looking for a new church. Sometimes people are looking because they are new to the area, sometimes they are looking for a new start, sometimes they are new in their faith. Almost all of the time people tell me they're looking for a "healthy" church. What in the world is a healthy church? I want to explore this for a little while, but I want to start by asking you, my loyal readers, what you define as a healthy church. Does anyone care to weigh in?