For us, I earn a little more than my DH but he has tons of law school loans so I end up contributing more toward our shared expenses. Before the recession, my DH had a big law job and earned twice of what I made and I always felt slightly guilty about earning less - almost as if I wasn't contributing enough. Now that our positions are reversed, I hope my DH doesn't feel that way.
How about you? Do you earn more/less than your SO?