Finally, a question I can answer instead of ask on this board! Hahaha
Vinylmation are collectible vinyl figures shaped like Mickey with a screen print on them to look like a well known disney character, attraction, park, film, special event logo, etc... There are over a dozen different series types, although the two that seem to be the most popular are the Urban and Park series. The 1st Park Series was a limited run, mainly to test to see if the figures would become popular. They exploded, and each set has had bigger and bigger amounts made, lowering the value of the later series.
For example, the rarest vinyl from Park 1, the Mickey balloon head chaser, sells for upwards of $600 on eBay, but there are some vinyls in Park 3 and 5 series that people have a hard time giving away.
Each main series has 12 figures in it, with a few exceptions. In these series, there are 11 normal figures and 1 'chaser' which is much more rare (The balloon mickey was the chaser for park series 1). In a full case of vinyls, there are 24 boxes, which include 2 of each regular design, 1 chaser, and 1 triplicate of a regular design chosen at random.
There are also Super Chasers. These are Chasers that don't appear in every box. For example, in the original Star Wars series, there was an Obi-Wan Kenobi chaser. Some people however, were shocked to find an all clear version called Ghost Obi-Wan. These sell now for almost as much as the Park 1 Balloon.
Trading in the parks can be fun for kids, and once in a while you'll see a chaser someone unwittingly traded in to the boxes, but for the most part as a collector I stay away from it for a couple reasons. One, the vinyls in the boxes have been handled a lot and may be damaged or have paint scuffs, and two, they usually don't have the collectible card that comes with them, although in later series, there are no cards, so it's become less of an issue.
The most fun part is collecting the designs that mean something to you and your family. My favorite vinyl is from a 9" series (the larger ones that retail for $45) of the Sci-Fi Dine-In, which is our favorite restaurant to visit in WDW. The front of the Mickey is the logo from the Restaurant, and the back features a car at a drive-in movie theater with a monster in it, fitting in with the drive-in and sci-fi themes of the restaurant. I wouldn't trade it for anything! (Well, maybe a million bucks, if anyone offered

)
Hope that helped out, and didn't just confuse you more!