I love children's writing. It can be fresh, fun, and unexpected. It can also be rare. E-mails just don't have the staying power of a pen (or pencil) and paper correspondence.
But recently I got a batch of thank you letters from a group of 4th graders at the grade school from which my son graduated. I had donated some new books to the school.
The librarians and teachers are always appreciative as their budget frequently doesn't allow them to purchase new materials.