NHL 11: Attribute Descriptions

Directly from the demo (important parts of descriptions) here you go:

Offensive
Dekeing: More accurate loose puck dekes and more accurate shot after dekeing.
Hand-Eye: Affects deflections, batted pucks, one-timers, ability to pick up hard passes.
Offensive Awareness: Better vision for passing and a knack for finding the back of the net.
Passing: Passing accuracy, blind passing, passing through traffic, makes passes easier for receiving player to receive.
Puck Control: Control through hits, poke checks, and lift checks. Also, determines ability to do on knees deke on breakaway.
Shot accuracies: Shot accuracy.
Shot powers: Shot power.

Defensive
Aggressiveness: Bonus to hitting intensity. Big hits intimidate. Intimidation affects opponent shot quality, pass accuracy, and aggression.
Body Checking: Allows bigger hits and affects intensity of hits.
Defensive Awareness: Ability to take away passing lanes, lower susceptibility to being deked, and greater effort on back check.
Discipline: Affects likelihood of taking penalties like elbows (may apply to trips and high sticks as well, does not say).
Faceoffs: This is one of several factors in winning faceoffs (others being strategy and timing).
Fighting: This along with strength affect punching power.
Shot Blocking: Higher shot block means getting up quicker from shot blocks also means doing a diving block rather than standing two leg block more often.
Stick Checking: Ability to take the puck with poke and lift checks and likelihood of getting penalized while doing it.

Athletic
Acceleration: How quickly you get to top speed.
Agility: Ability to turn and ability to turn with speed. Helps with back skating on defense.
Balance: Increases resistance to being knocked over on a hit and improves puck control.
Durability: Decreases chance of being injured.
Endurance: Rate at which players recover energy when not skating with high effort. Fatigue is a bigger factor if a player has a low endurance. Fatigue affects skating and shooting.
Speed: Top speed. A player can't sustain top speed without high endurance.
Strength: Affects shot power, fighting, checking, resisting hits, and boardplay. For boardplay affects ability to pin players and ability to slip free.