I have found Orbitz is the move now. ITA matrix was the move, but with the new version, it's no better than kayak or travelocity. Orbitz has found fares that were simply lost on kayak--just not available. Interesting because kayak is supposed to search orbitz. But I found a $2700 business class fare on Orbitz, and the same route was $4000 on kayak. Unbelievable.