Rocky Boiman, LB - Indianapolis: Last Week: bye; This Week: 1 special teams assisted tackle
Jerome Collins, TE - New York Giants: Last Week: inactive; This Week: inactive
Anthony Fasano, TE - Dallas: Last Week: bye; This Week: 1 catch 5 yards
Marcus Freeman, TE - New York Giants: practice squad
David Givens, WR - Tennessee: Physically Unable to Perform
Ryan Grant, RB - Green Bay: Last Week: bye; This Week: 27 rush 201 yards 3 TD, 2 receptions 3 yards, 2 fumbles
Craig Hentrich, P/K - Tennessee: Last Week: 5 punts 198 yards 39.6 average 37.2 net 43 long
Carlyle Holiday, WR - Green Bay: Injured Reserve
Julius Jones, RB - Dallas: Last Week: bye; This Week: 3 rush 8 yards
Derek Landri, DT - Jacksonville: Last Week: 1 interception 3 yds, fumble recovery, 1 sack 3 yds, 1 pass defended; This Week: 1 assisted tackle, 1 quarterback hit
Sean Mahan, C - Pittsburgh: Last Week (team): 43 rush yards 2 TD, 337 pass yards 6 sacks
Luke Petitgout, T - Tampa Bay: Injured Reserve
Allen Rossum, CB/PR - Pittsburgh: Last Week: inactive
Hunter Smith, P - Indianapolis: Last Week: bye; This Week: 1 punt 49 yds touchback
Maurice Stovall, WR - Tampa Bay - Injured Reserve
Justin Tuck, DE - New York Giants: Last Week: 2 tackles, 1 assisted tackle, 1 quarterback hit; This Week: 1 tackle
In addition, several coaches with Notre Dame ties are in the playoffs. I didn't have time to track down stats, or even to find everyone that may be associated with ND, but these few jumped out:
Green Bay: Tom Clements Quarterbacks Coach, Kurt Schottenheimer Secondary Coach
Jacksonville: Andy Heck Offensive Line Coach
New England: Dean Pees Defensive Coordinator
Tampa Bay: Jim Gruden Personnel Consultant