Here are a few articles related to the art, science, and theory of fantasy trades.

Fantasy & Reality: Making the right deal
Fantasy Trade Critic
Luck (BP)
Science of Trades - The 1-for-1 Swap (scroll down)
Science of Trades - The 3-for-3 Drop Scam (scroll down)
Separating the Trades from the Raids
Trade Dominator
Tricks of the Trade
When Losing the Trade Battle is a Good Thing