A coalition of mayors in favor of gun control, led by Michael R. Bloomberg of New York and Thomas M. Menino of Boston, said on Monday that it had reached a 10-point agreement with Wal-Mart, the country's largest seller of guns, to track the sale of firearms more closely. The agreement between Wal-Mart and the group, Mayors Against Illegal Guns, which Mr. Bloomberg helped to organize in 2006, calls for turning a more watchful eye on firearm sales, including videotaping... (GunPolicy.org)