The original Pal (1.0) was Mickey in just his standard outfit with shorts, no shirt.
The second edition (2.0) was the 50th Anniversary and in addition to his normal shorts, he's wearing a {removable} black tuxedo jacket. His right hand also has a {non-removable} gold medallion affixed to it. It would trigger people's Glow Medallions to blink when they came near each other.
The third edition (3.0) which came out last year, is Mickey in his red shorts, Sorcerer Mickey red robe and blue Sorcerer's hat. This outfit (excluding shorts) is also removable. It is the most current edition and has the most updated content.
In addition to the actual version changes which update content and have added new games to his system, they have released several outfits separately which ANY version can be dressed in. These outfits are just clothing changes and aren't actual
editions of Pal. They include Tourist, Pin Trader, Poncho, Safari, Pirate Captain, and Santa Mickey. Santa Mickey sold out during December 2006 and is currently discontinued.
People selling "Tourist Mickey" are selling
some version of Pal dressed in the Tourist outfit. You'll need to refer to the auction to determine which actual version he is. Odds are, he's probably an older version they got cheaper once it became discontinued and just put him in a new set of clothes. (For example, a friend picked up a 2.0/50th Birthday Edition one for me from the CM store for only $10 after the newest version came out.)
I'd be careful about buying Pal on ebay only because you don't know what you're getting. Does it work? Is it new? Is it the current version? Why are they selling a $65 item for less then it's retail cost?
Yes, all versions continue to work in the parks just fine. However, the older versions will have outdated information. (My 1.0 for example, still talks about "Alien Encounter" instead of Stitch.)
If you have any other questions about Pal, feel free to ask. I'm kinda the unofficial Pal answerer around these parts.
-m