Paul DePodesta with some excellent philosophic and strategic notes about mid-season trades. I like this:
The Volume Myth
I have to address this one, because we always joke about it internally. Overwhelming teams with volume is not a recipe for bringing back quality players. Every team out there is smart enough to know that four times zero is still zero: “But what if we add this 4A guy AND this marginal prospect? No? Well then… what if we were to add this long reliever as well?” It takes quality, not quantity, to get quality.