TIPP CITY, Ohio-It is not that Ginghamsburg United Methodist Church sits in the middle of a Midwestern cornfield that makes it notable. Nor even that its pastor preaches in jeans and sandals to a working-class congregation sipping coffee in shorts and T-shirts. More to the point: Of the hundreds of American churches, ministries and local faith-based organizations that for nearly three years have poured themselves out on behalf of wounded New Orleans, few have matched the sustained commitment to Hurricane Katrina victims of this megachurch 15 miles north of economically depressed Dayton, Ohio. Over two and a half years, Ginghamsburg has sent 41 teams of volunteers to help rebuild the New Orleans area. They are still coming.