... is a blog which provides masses of useful precise information about the Prayers as well as the readings of the OF. Most recently, the Postcommunions. So if you wanted to do a survey of what percentage of the OF postcommunions survived from S Pius V's book; what percentage come from the ancient Roman Sacramentaries but not from S Pius V; how many have ancient origins but have been corrected (and with what motives); what might have been the motives for dumping the prayers provided by S Pius V; and which are brilliant compositions de novo by the wonderboys of the 1960s ... this is where to go for your raw materials.
Why not go for it? It would be very jolly to have the evidence wherewith to answer the following question
"Would the body of postcommunion collects in the Novus Ordo support a claim that the revisers followed the prescription of Sacrosanctum Concilium that there must be no innovations unless the good of the church genuinely and certainly requires them?"