Lee Shelton writes about a variety of topics ranging from theology to cultural issues. He usually tackles these from an apologetic perspective. I find myself frequently challenged by what he writes about the Christian walk - especially whether or not I am living a sacrificial, loving life.
The best part about Shelton's blog is his weekly feature entitled This Week in Calvinism. Keeping in mind that Lee is a Calvinist (see the blog title for that obvious one), he writes from a Reformed perspective. In This Week in Calvinism, Lee points out various things that are happening in the evangelical world related to Calvinism. These come mostly in the form of links - to historical writings, to Reformed authors, to people writing in favor of Calvinism, to people writing against Calvinism, and (humorously) to people writing against Calvinism who have no real idea what Calvinism even is.
This blog is a fun one and is worth taking a look at.