Here I will put certain snippets of research conducted on the Discworld.

Faith rods (batons only for now), and their (numerical!) affinities

How long can you wear a bronze helm or flat cap, and how do you die?

Priestly Links:
http://users.pandora.be/LaoTzu/Priests
http://www.godbotherers.co.uk
http://sinedondisc.tripod.com/priest/