I don't want to piss on the parade here but some of you are jumping the gun. What these two rulings do, collectively, is to reinforce state's rights. If a state wants to allow gay marriage, it can and if it wants to deny gay marriage, it can. The federal government cannot discriminate against citizens who are legally married in a given state. Moreover, in the Prop 8 situation it denied the right of a citizen to challenge a ruling on a technicality. This worked great in California where the governor decided not to challenge the lower court ruling but let's take any state in Jesusland for a counter example. If only the state government can decide to bring an appeals ruling forward what the court has done is sanctify TWO Americas.
Add in the disastrous ruling on the Voting Rights Act of just a day ago and we see a growing divide between the liberal coasts and the fascist south/west being codified by state law.
So temper the enthusiasm with a dose of reality. There is a long way to go in this country.