I just started Pin trading during our last trip to WDW- January 2012. I LOVE it!! I don't collect anything in particular, just anything that I like or means something to me. I tend to go for Stitch and Tinkerbell the most. My husband collects Star Wars pins only.
I learned that I don't really trade pins that I buy because I want them. I buy the "mystery packs" where you get 2 random pins in a package, they are less expensive that way and then I am not attached to them. Also buying the theme sets of 5-6 pins makes each pin cheaper and then you can trade them. I don't like to trade the full price pins. A lot of people buy pin lots on ebay to trade, but you have to be really careful because there are a lot of fake ones out there!
Trading is so much fun- I trade with cast members mostly because you have the most control over the trade- you pick what you want from what they have, and then you trade them any pin you have in good condition. And I like getting the hidden mickey pins from them. I have done a couple of trades with other guests when they approached me. It is such a great way to get to chat with the Cast Members. some are kind of blase about it but most are really into it and fun! I just love looking to see which ones cast members have and trying to track down a good find!
I didn't read the whole thread so I don't know if someone has already mentioned this, but 2 great websites for pin trading info are:
Official Disney Pin Trading page
and
Pin Pics
Also, the kiosks where they sell pins in the parks have pin binders you can look at and see pictures of the different hidden mickey collection pins. Some places also have awesome "pin boards" which are just big corkboards full of pins- so fun to browse! I know there was one outside of the shop in the entrance area of AK when we were there.
Disney's Pin Traders, the big pin shop in DTD is fantastic. Also the Pin Trading spot in front of the Fountain of Nations is cool- they have tables set out for trading among guests, and we saw some really amazing collections there.
Here is my collection so far:
For the most part, the ones on the left are ones I purchased and the ones on the right are ones I traded for.
Have fun!!