Hey, I'm not sure if this has already been covered but i haven't seen anything on it so i assume not, I was thinking of the various armour types and damage effects and how this could be adapted to archery which led me to purpose crafted arrowheads, i.e. bodkins, broadheads etc.. after a bit of research i also found info regarding mechanical arrowheads that release blades on impact through a spring mechanism thing which also sounds quite cool.
http://en.wikipedia.org/wiki/File:Cr%C3%A9cy-en-Ponthieu_24-09-2008_12-11-33.JPG
I think this would add to the gameplay mechanics of archery and is a natural expansion of the BG system of "flaming arrows", "acid arrows" etc... What are your thoughts?