A collection of Dark Souls .PDOs : http://www.4shared.com/zip/AN5Mdlz4/..._Pepakura.html
I will update this with more files if anyone is interested. I should have just about everything but shields, so if you have any requests let me know and I'll get it up.
This should be all of the sets of armor in the game. They're .OBJ files, which will work in Pepakura (and most 3D modeling programs). If you have blender you can use it to pick out single parts of each set (helmet, chest, legs, etc.). There are also some misc items in here, like the Symbol of Avarice and the Boar's Head. http://www.4shared.com/zip/tombVEFZ/...armor_obj.html
I'm working on weapons right now, in fact I'm about to start my own Silver Knight Straight Sword build. I'll update again when I have more available; if you have any requests for specific armor pieces, just ask and I'll see what I can do.