The first one is by Dr. Seyoon Kim on the centrality of the cross in one's theology and the necessity of penal substitution to our understanding of the cross. I would level it a very important read regarding the question of penal substitutionary atonement. Dr. Kim gives and superb defense of this glorious doctrine. It is entitled "The Atoning Death of Christ on the Cross." You find it here.
From the conclusion
Thus, when the doctrine of Christ's penal substitutionary atonement on the cross—and the doctrine of justification that issues from it—is properly expounded, it can integrate the Christus victor motif in itself and provide the adequate basis for sanctification or imitatio Christi…Evangelicals, if they are to be true to their historic identity, should not succumb to any polemics based on distorted versions of the Biblical doctrine of Christ's penal substitutionary atonement, nor yield to the attempts to marginalize it for the sake of the (independent) Christus victor theory or the (biblically questionable) moral influence/example theory. Rather, they must uphold the doctrine, expounding it fully and celebrating the grace of God that it highlights.
The second is by Dr. James Hamilton on the book of Song of Songs. It is entitles, "The Messianic Music of the Song of Songs: a Non-Allegorical Interpretation." You can find it here.
I found Dr. Hamilton's take to be insightful and refreshing. There seems to be two extremes regarding the book of Song of Solomon, one is to just make it into a big allegory of Christ and the church and the other one is to make it into a steamy honeymoon scene. I personally don't like either of those. "Rather, this study pursues an interpretation that sees the Song in the light of the messianic expectations evident in the OT canon." (from the article). I liked the balance where both the reality of the figures is kept and a connection with God's salvific plans is made. And I believe Dr. Hamilton has done both.
You can find more of Dr. Hamilton's writings at his blog.