This is a list of pre-draft visits and workouts that have either already occurred, or are scheduled to occur. It is undoubtedly incomplete.
Kevin Brock - Giants, Packers, Patriots, Texans
Kenny Britt - Bears, Bengals, Browns, Dolphins, Giants, Jets, Patriots, Ravens, Titans, Vikings
Courtney Greene - Broncos, Falcons, Giants, Jets
Kevin Malast - Giants, Patriots
Jason McCourty - Browns, Falcons, Giants, Jaguars, Jets, Packers, Ravens, Texans
Mike Teel - Bears, Bengals, Dolphins, Giants, Jets, Patriots, Ravens, Seahawks
Pete Tverdov - ?
Tiquan Underwood - Patriots
Jamaal Westerman - Bears, Jets, Redskins, Texans
By the way, Greene had a radio interview earlier this week. He spoke with the Broncos, Browns, and Jaguars at the Combine. There's a lot more in the interview.