According to the team's official website, the Dolphins today hosted DT William Joseph:
Some of you may remember him from his days at The U. At 6'5, 308, Joseph would be an ideal fit to play the defensive end spot in a 3-4 and then shift to the inside when the team goes with 4 down lineman. Joseph, though, did miss all of the 2007 season with a back injury.
Joseph, as the quote says, is a former first round pick. And at only 28 years old, he could still have plenty of upside. If nothing else, he'd provide depth for the defensive line.