Maybe I should cease being shocked by this sort of thing, but new data out of UNICEF shows that the gender gap in wages isn't much smaller in American than it is in the developing world.
We should be so proud. Indeed, what's remarkable about the wage gap is how near-constant it is across the world. You'd think the richer countries would have gotten fairly far in eliminating it, but you'd be wrong. In fact, last year saw a slight decline in the domestic wage gap, but the reason was that incomes for males had slipped, not that salaries for women had increased.
If you're interested in more on the causes, effects, and possible solutions to the male-female wage gap, you can't do better than Echidne's series on the subject.