Like I've mentioned in other posts, Callie has taught me to be more selfless. Boy, do I apply that to my marriage.
Everyday, (usually in the morning) I think to myself "what can I do to make Shawn's day easier or more pleasant?". Sometimes I even ask him (usually he says "come home and let me see your beautiful face" or something cheesy like that). I try to do AT LEAST one thing a day for him. It can range from making his lunch to mowing the lawn for him (or taking care of a phone call that he doesn't want to make). Anything that lightens his burden and makes him feel loved.