What's a Stay-At-Home Parent Worth?

According to Salary.com, a year of stay-at-home-parenting is worth $117,856.  If nothing else, it's interesting.  Personally, I think caring for Henry is priceless, but I still think it's comforting for both Chris and me to see studies such as this one.  I'm NOT wasting my degree, damn it!    

http://www.sfgate.com/cgi-bin/blogs/sfmoms/detail?blogid=46&entry_id=63196