Over at The Gospel Coalition's web site, Don Carson has a "blog" of sorts.  It is not really a blog, but rather a free online version of his wonderful books For the Love of God (2 volumes, Crossway).  In these "posts" (sections of the books) Carson follows Robert Murray McCheyne's outline for reading the Bible in a year, and offers comments on the passages read on a given day.  Carson's two volumes are perhaps the best "devotional" reading I am aware of.