I have been enjoying this great series of lectures:
Dr. Jack Fish on Romans (click to view on iTunes)
|Dr. Jack Fish|
Dr. Fish does a great job of bringing the exegetical aspects of the text together with informative discussions of historical and systematic theology. A graduate of Brown University and Dallas Theological Seminary, his perspective is definitively Calvinistic and probably dispensational. Overall, the course is very edifying and educational. If you're looking for a good study of Romans, look no further.
The course includes 28 lectures, each one offering an in-depth exposition of a single passage.