It's called Leave a Legacy. My son and I did it last time we were there and loved it. You get a special disney pin, they take your picture, it's etched on a plate, and you will recieve a real nice package with you're "photo" (clear plastic, with potographic etch? hard to explain) in a silver leave a legacy cardbord frame. You can also put text such as names but I'm not sure if you can call and have it done.
Also, I think if you have an anual pass that you get 2 for 1. One thing I had heard though is that it's only supposed to stay up for 20 years. I was hoping it would be like the bricks that would stay there forever.