Diablo 3 RMAH is out and it is possible to make money
Both the US and the EU RMAH is live and you can sell your gold on it. Currently there is a bottom price you can sell it for, and that is 2.5 USD/EUR per million gold. On the black market you can get a million gold for a little over 1 USD and around 1 EUR.
Gold is not selling on the EU RMAH, but it is selling on US RMAH, you just have to be patient and have auctions up continously. The gold selling is working on a queue system, since you can’t underbid each other, because the gold price is at the bottom. So keep trying and you might get lucky!