Given how I enjoy liturgical minutiae, I found this article at the New Liturgical Movement rather interesting.
Liturgical Variations in the Most Unlikely of Places: The Paten
Well, actually categorizing it under liturgical minutiae is not accurate. Given it has to do with the rubrics the priest must follow using the paten, the layman in the pew wouldn't be informed about this. Still, the details are interesting, and you could go into further details by looking at the Eastern rites and how they use the paten, as some of their liturgical actions are even more complex (as in how they arrange the pieces of bread on the paten before the Consecration).
Could you imagine trying to slide some of the huge "bowl-like" patens used at modern Masses under the corporal?