In the March 2012 issue of the Journal of the Evangelical Theological Society, Andreas Köstenberger has a short, concise, but extremely helpful editorial on the current state of biblical theology within the wider discipline of New Testament studies. In this context, biblical theology is a historical discipline which aims to set forth and explicate the theology of the NT authors themselves and then the theology of the biblical text itself. Köstenberger helpfully identifies four current approaches to biblical theology, explaining the differences between them and discussing current scholars who have adopted each approach. I looked for an online version, but none is available yet. So if this topic interests you, head to your library and check it out.