If you have pieces of trim that are big enough to do anything with, then habitat for humanity is a great place to donate it.
If you have scraps that can't really be used, then give it to me. I burn it in my wood stove and it helps keep my house warm without putting load on the grid.
Well, you don't know me and I don't know you, but maybe you know someone with a wood stove who you can give it to.
If you have a whole lot (like a pickup truck full) you could sell it on craigslist for firewood. Maybe $25 for softwood or $50 for hard. Just not plywood or anything finished.