A total of 18 trades were made involving strictly picks from the 2011 NFL Draft. One of those trades included a deal between the Detroit Lions and Seattle Seahawks. The Lions, as you know, traded back into the second round to take Illinois running back Mikel Leshoure with the 57th overall pick. They gave up a third- and fourth-round pick and also swapped selections in the fifth and seventh rounds to make the deal happen.
ESPN's Mike Sando analyzed trades that had only 2011 picks based on the draft-value chart, which assigns points to each selection. By doing this, he was able to see which teams "won" their trade by totaling up the points of each selection that was dealt.
The Lions gave up the following picks in their trade with Seattle: 75, 107, 154 and 205. The values of these picks equaled a sum of 336.2. The Seahawks gave up these picks: 57, 157 and 209. The values for these selections equaled 368.4. This means the Lions received a set of picks worth 32.2 points more than what they gave up.
Based on the traditional draft-value chart, the Lions technically won their trade. Obviously teams could have different values on their own charts, and some teams could have different criteria for "winning" a trade. Even so, the Lions came out with a higher value of picks from this trade, which allowed them to take Leshoure in the second round.