Thanks, Elizabeth - it's been fun for me too!
I think that historically, evangelicals have championed overseas missions in a way that has not been true with domestic urban ministry. We've romanticized the heroic overseas missionary, going to the far corners of the world. At the same time we've had something of an anti-city bias. Evangelicals have tended to view cities and urban centers as dens of iniquity and evil. And part of this has been affected by America's racial history and dynamics; even though both suburbs and cities are far more diverse today, there's still a cultural narrative that says that white folks live in the suburbs and other folks live in the cities, and thus suburban white churches have been nervous about urban connections/ministries because of their "otherness."