Richard Beck is a well-respected and loved professor of psychology at Abilene Christian University in Texas, and he keeps this very popular blog, Experimental Theology. It's the best blog that I read.
Beck's interests are pretty wide-ranging, though his focus is most typically on the intersections between Christian theology and psychology. Some of his heavier topics include universalism, what Freud has to teach Christianity, the Summer and Winter experiences of faith, the influence of sociomoral disgust on the life of the church, and many others. He's composed long series devoted to exploring the influence of such figures as Bonhoeffer, Teilhard de Chardin, Rine Girard, George MacDonald, and (most prominently) William James. Not every subject he covers, though, is so weighty. He additionally has series of reflections on such popular subjects as the theology of Calvin & Hobbes and Peanuts, the spiritual significance of particular holidays, and Facebook's influence on the church.
Some of this may not sound like reading for the non-academic/non-specialist, but it is. Beck is a wonderful educator and communicator, and he's written the blog for intelligent people with all levels of training and who hold many different perspectives. His tone is conversational and humorous. He is sometimes provocative (though I usually tend to find myself seeing things as he sees them) but is always, always intriguing, insightful, and compassionate. I really think that he's one of today's most important Christian thinkers who could be read for many generations to come.