It looks like the issue of paid maternity/paternity/family leave is going to start with state legislation. MomRising.org is a new organization that was started by the same woman who started MoveOn.org. Sign up for their email newsletter so you get action actions alerts about the issue of paid family leave in the U.S.:

http://www.democracyinaction.org/dia/organizationsORG/momsrising/signUp.jsp?key=1682&t=longsignup.dwt