There are a lot of blogs you can read, but not all are worthy of your time. Here is a new one written by friend and colleague in New Testament studies, Sam Tsang. Like myself, Sam has done work on Paul and slavery and has a heart for both the church and the academy.
His blog is Engaging Scripture and am I sure you will be challenged as you read it.
Update: It appears Sam has started two blogs. his other blog is a preaching blog at Engaging the Pew.