One of the things that we've always recognized it our strenghts and weaknesses. Mine, is the office and his is maintenance. What a perfect match for this job!
Stop by About.com Marriage website to participate in their poll question, "Has working together hurt your marriage?"
Also, take a look at the article, Working Together -- Being Together 24/7, for hints and tips. Some of my favorites are agreeing to disagree, starting the day discussing the plan of the day and keeping your sense of humor!