If you're a fan of lists (and I am), you'll find the following very interesting. MarriageCounsellingBlog.com have composed a list of 10 small changes you can make to improve your marriage.

I particularly like number 4 - Focus on what you contribute, not what you gain:

Take a look at what you are contributing to your marriage each day. Instead of focusing on what your partner hasn’t done for you or what’s not working, only focus on what you are doing to grow the marriage.
— MarriageConsellingBlog.com