Well, maybe not for dummies, but a 144 page stripped down version of Grudem's Systematic Theology is going to be published. I find these sorts of books immensely helpful (see also Packer's Concise Theology, Berkhof's Summary of Christian Doctrine, Sproul's Essentials). Grudem's book, edited by his son Elliot, will be called Christian Beliefs: Twenty Basics Every Christian Should Know. Look for it in November.
(HT: JT)