http://www.bostonsportsmedia.com/
This pick was the one that they acquired from the San Francisco 49ers yesterday in addition to the Niners 2008 first round pick in exchange for the Patriots first round pick at #28 yesterday.
So in effect, the Patriots traded the #28 pick for Randy Moss and the 49ers first round pick next season.
Taking it a step further, perhaps they would not have made the deal had they not had an additional pick from the Deion Branch to Seattle trade, so this could be viewed as Branch for Moss and a #1 pick.