In the District of Columbia, the Jury and Marriage Amendment Act of 2009 (JMA) took effect on July 7, 2009, recognizing same-sex marriages performed in other jurisdictions.
In Maine, opponents of same-sex marriages reported yesterday that they had enough signatures to delay the implementation of their same-sex marriage law and put the issue on the November ballot.
And here in Massachusetts, Attorney General Martha Coakley announced that she had filed a suit in US District Court challenging the constitutionality of section 3 of the Federal "Defense of Marriage" Act (DOMA), which added 1 USC sec.7: Definition of Marriage and Spouse.
Details and more resources are available at Law About Same-Sex Marriage.