North Point Community Church in Atlanta, GA uses WordPress for many of their websites. Their main site uses Expression Engine, but many of their other websites use WordPress. This is the last in a series of posts highlighting some of those websites. North Point created InsideNorthPoint.org to share their resources and ideas with other churches. The site originally ran on WordPress Mu (and might still) as the different sections have different blogs and themes.
You might be interested in subscribing to their IT/Web blog.