I haven't read them yet, but there are two new District Court decisions invalidating provisions of the Defense of Marriage Act. From Talking Points Memo:
Taken together with the decision this week of the governor of Hawaii to veto civil unions, this seems to be another very important step in the direction of marriage equality. (What's the connection? The decision in Hawaii suggests that civil unions are not a sufficient alternative.)
Of course, there are many months and many hundreds of pages of briefing before these cases are resolved, but it sounds like a big step.
It's also a response to people who are opposing state marriage laws because they won't have any effect on federal benefits.