According to Salary.com, stay-at-home mother's work worth $138,095 a year. See the article from Reuters for the full story.
I definitely think the taking care of the kids and household is a lot of work. I am doing my part to help out.
Even though every day should be Mother's Day (or Father's Day) in my opinion, May 13th is the day we choose to celebrate mothers around the world. Remember to show your appreciation to all the special women in your life who are mothers, on the day or any day. I and my kids are still looking for the gift for my wife.