The discussions about Mormonism and Christianity are going to intensify rapidly in the next couple of years, especially if--as I suspect--Gov. Mitt Romney will be the GOP presidential nominee in 2008. Now is the time for Christian pastors, leaders, and teachers to bone up on the subject with a view toward instructing the church in answer to the inevitable questions that are going to arise. (This topic was a significant part of Hugh Hewitt's plenary address at ETS, where he suggested to the evangelical scholars in attendance that it would be a serious mistake for evangelicals to reject Romney because he is a Mormon--in part because the exact same premises will be used in arguments to exclude evangelicals from the public square. Hewitt also revealed that he is almost done writing a book on Romney.)
For an introduction to the history and beliefs of Mormonism, a helpful place to start reading might be Richard and Joan Ostling's Mormon America: The Power and the Promise. Richard John Neuhaus recently reviewed it, and along the way he provides a helpful primer in his own right.