I haven't tried Pal Mickey, but it is an interactive toy/guide. Here is a description of one that I saw on eBay:
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1) He will talk to you in the parks, giving you tips and information. he says over 700 different phrases. For examples: He will tell you where the good place to go for the fireworks, which ride is near you, or the wait time for the attractions, etc...
2) TIPS-Helpful Hints for more fun,show time reminders & characters locator
3) FACTS-fun facts & park discoveries from the ultimate disney insider
4) FUN & GAMES-keeps you laughing with jokes and games. Test your park Knowledge Take Mickey Home For More... JOKES-listen to funny jokes
5) GAMES-play 3 fun disney games FACTS-lots of fun disney trivias
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Now, *where* can I rent a Pal Mickey???? I assume you rent them somewhere at the parks? Do they often sell out of them for the day?