American Airlines has a new promotion for 500 free AAdvantage miles for updating contact info on file with AA to include your date of birth and some other information. This update needs to happen before February 28, 2013. You can access this offer here.
This offer is valid for Canada and most of the countries in the Caribbean. United Kingdom is included in the terms and conditions of this offer, but is not included in the drop down menu of countries to choose from, however. EDIT: United Kingdom has now been added to the drop down menu.