I donated my old chryco van through the local battered and abused womens shelter. I DID enjoy the tax savings, but the real dilemma i had was not looking around for a family that needed a family van and just giving it to them. In the end i decided to go through the shelter, figuring they would screen the family and have a better idea of who really needed it most.
They came and took the van away promptly (with a borrowed dealer plate), I saw it while driving by the place as it was being stored until they gave it away, and subsequently saw it a couple of times on the road.
Unfortunately, I saw the van on the side of the road about four years later. I hope it gave good service until the end.