Games of interest tonight:
Buffalo @ Washington
As already mentioned, both are 4 points back and hold a game in hand. After tonight, the games in hand are gone, and one of them will be just 2 points back. Please, God, no three-point game.
Chicago @ New Jersey
The Sens are just 2 points back of the Devils for the coveted 6th seed (well, it's not as coveted as it used to be, since the 3rd place Panthers are just 4 points back of the 2nd place Bruins). The Devils have one game in hand, and the Sens play them one more time on the last day of the season. If the Hawks win, in regulation, then the Sens will control their destiny -- they would be able to move up at least to 6th by winning their remaining games.
Tampa @ Boston
The Sens are just 3 points back of Boston, although Boston has 2 games in hand. It will take more than a loss tonight and Ottawa winning their remaining games, but passing the Bruins and grabbing 2nd is not (yet) outside the realm of possibilities.