The USCIS has updated their FAQs page on same-sex marriage. Here are the first two Q & As:
Q1: I am a U.S. citizen or lawful permanent resident in a same-sex marriage to a foreign national. Can I now sponsor my spouse for a family-based immigrant visa?
A1: Yes, you can file the petition. You may file a Form I-130 (and any applicable accompanying application). Your eligibility to petition for your spouse, and your spouse’s admissibility as an immigrant at the immigration visa application or adjustment of status stage, will be determined according to applicable immigration law and will not be automatically denied as a result of the same-sex nature of your marriage.
Q2. I am a U.S. citizen who is engaged to be married to a foreign national of the same sex. Can I file a fiancé or fiancée petition for him or her?
A2. Yes. You may file a Form I-129F. As long as all other immigration requirements are met, a same-sex engagement may allow your fiancé to enter the United States for marriage.
You have no idea how happy it makes me to read that.