demiurge1138
Inventor of Super-Toast
That's in Oriental Adventures. Shadowlands oni and other tainted creatures have DR/jade, with obsidian acting like jade +.I had one of the evil fiend types DR overcome by weapons of wood and bone (or other organic materials, such as claws, teeth and a Monk's spinning backfist). I vaguely recall seeing weapons of obsidian as one DR penetrating material and weapons of jade as another DR penetrating material.
I suspect we'll see Pathfinder's daemons with DR/good only, but silver is traditional for daemons and yugoloths in editions past (A'kin the Friendly Fiend from Planescape only took copper, gold or platinum coins at his shop, as silver would burn his hands). Wood, for its ties to the natural world, might make for a good material, especially considering that Pathfinder daemons, being allied with one of the four Horsemen (pestilence, death, war, famine) would be despoilers of nature.