Check this out:

Paycheck for Mom's job

The article takes a look at how much full-time Moms theoretically should be earning salary-wise for their work, taking typical overtime into account as well as the various necessary skills. They come up with around $100,000-$140,000 a year. :-)

Found at the Spiegel article about the article: here

Stephi, Mom, full-time Moms everywhere, I salute you. You are totally underestimated by our culture, and you have the inner strength to choose to go against the flow.