The Hague Convention on the International Recovery of Child Support has just been finalized, and the US has already signed onto the convention (only signer so far), as reported by the International Family Law Blog. See its post of today: International Family Law: Hague Convention on the International Recovery of Child Support.
"Delegates from sixty-eight States and the European Community have finalized the Convention on the International Recovery of Child Support and other Forms of Family Maintenance at the 21st Diplomatic Session of the Hague Conference on Private International Law.
Basically, the states that ratify the convention agree to assist citizens from other states who have also ratified the convention to recover child support.
The United States immediately signed the Convention, the first (and, thus far, only) State to do so...."