This New York Times article brings the tips on what to watch out for when buying organic milk. For example, while organic means that the cows weren't fed synthetic growth hormones, antibiotics or pesticides, the requirement that the animals have "access to pasture" is a standard that varies widely across companies. Pasteurized vs. ultrapasteurized and grain vs. grass are also under debate – all more evidence that as organic food increases in popularity, organic standards will come under increasing pressure from companies who want a piece of the market share without the added cost of adhering to stringent regulations.
Take a look at EWG's work on organics and pesticides.
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