Timothy Scott Flanders has a great blog, Pater Noster, which is worth checking out. I encourage folks to read all of his posts but here are some of special interest:
An Eastern Orthodox Christian Looks West
Is the Papacy a Constitutive Element of the Church?
The World Wars and the rapprochement with the Corpus Christianum
Fr. Sergei Bulgakov illuminates the most salient point of Ecumenism