In two posts, Hoppenbrouwers writes a thought provoking essay on the sources that historians use to analyse Pius XII. It is a good start and I hope he continues. Looking at ADSS he comes to the conclusion that reading ADSS gives much detail into the operations of the Vatican during the war, but does not help get us any closer to answering the question of the "silence" of Pius XII. Taking ADSS Volume 8.184 he argues this is probably the first document that explicitly speaks of a systematic killing of Jewish civilians. I am inclined to agree. He follows this by referencing to the growing acknowledgement of the killing process using ADSS 8.298 and 301.
As I mentioned above, I hope Hoppenbrouwers continues writing on the subject. There is a need for greater depth in establishing context around the subject. Referencing John Morley's excellent work is indicative of serious intent, but there are subsequent works that have built on Morley such as Michael Phayer, Susan Zuccotti, Jose Maria Sanchez, Kevin Spicer, Deborah Dwork and others. Whether or not one agrees with their theses the fact remains that they have argued with the available material and helped deepen our knowledge.
I think the articles are worth reading.
Sources to the Pope Pius XII controversy - posted 10.09.2011
Sources to the Pope Pius XII controversy Part 2 - posted 11.09.2011