Pal Mickey is a doll you can buy that will tell you various pieces of information as you stroll through the parks. He gives you time information on shows, parades, and events and gives you little tid bits about various attractions.
I ::think:: the cost was 50 dollars, but I might be wrong
As far as it being worth it, I couldn't tell ya. It's something I was considering getting because it would keep us amused while waiting in line perhaps. I've never actually seen it in action.