I think it would be cool if there was a system in place that looked at your collection of games (maybe you have to mark games that are available for trade?) and then looks at your wishlist, takes those games and searches other Pinsiders' collections to see if there are any trade partner matches.
Boardgamegeek does something like this. You can mark your games as available for trade and you can mark games you don't have as want in trade. Then a simple search matches you with possible trade partners.