Go to the FairyGodmailer thread on the family board. That's where the people are who volunteer to do this. I've done this every trip. Basically, I get a list of kiddos who are going to Disney after my trip and mail them post cards (some do post cards/some send letters) while I'm at WDW (so they are post marked Lake Buena Vista). Parents provide appropriate details about the trip (kids names, ages, favorite character, and anything you may be celebrating). Then I write the letter as if I'm the character. It's very fun and if someone does it for your child, you could pay it forward while you are there.