
If you are interested in social teaching, and in particular, the question of continuity-rupture in this context, you will be interested in
Opuscula, the blog written by K Gurries. For example, his post
On Globalization and Political Authority analyses the concept of globalisation in
Caritas in Veritate and concludes with a survey of papal statements on International Order, asking the question "Rupture or Continuity?"
More recently, there is a post on
The Intervention of Mgr. Dupanloup (Part I) looking at how the great Bishop of Orleans defended the encyclical letter of Blessed Pius IX
Quanta Cura in the face of fierce hostility in the press.