I just spoke with a woman today and she assured me that they would give out every single card or letter to the evacuees, and that the people were truly appreciating them.
Here's their website: http://www.grassvalleyelks.org/Sub/Anno
They also take cash/checks, but most of all they're looking for cards and letters.
Send them to:
P.O. Box 314
Penn Valley, CA 95946
You can get creative if you want - I know one family that's sending some paper dolls their six year old daughter made to kids in the shelters.
Please also let me know if there are other places I should post this.