The story of Edith Windsor, now in her 80s, and her having to pay several hundred thousand dollars in inheritance taxes that a straight spouse would not have to pay, touched Justice Ginsberg, who referred to the idea of two-classes of marriage and even two-classes of citizens; she used the term "skim milk marriage".
The CNN reverse order blog is here .
ABC News has an account here and reports that Justice Kennedy questioned whether the federal government may regulate marriage, a state responsibility (with federal implications, though).
Justice Roberts castigated the Obama administration for "punting" to the Supreme Court on an issue it didn't want to defend.
The links for the oral arguments and transcripts for today's argument are here (United States. v. Windsor), March 27, 2013.
Update: Later March 27
Pete Williams on NBC expressed the sentiment that the Court may very well strike down DOMA and rule that, when a state allows same-sex marriage, the federal government (and even other states) must recognize it and provide appropriate benefits. This sounds more optimistic now than it had earlier during the day. The story by Tim Curry is here.
On Thursday, March 28, Robert Barnes has one of the most detailed accounts of the DOMS hearings in the Washington Post, with more links to arguments, here.