I received a restaurant.com card through my employer, and went to one of the supposed places that accepts it over the weekend. Turns out they really don't accept it and I had to pay the bill. It wasn't that much, but I was disappointed. I've had the card for months, and have decided not to use it after the last experience. It was for $50 dollars, which would have made for a nice dinner, but not many places accept it.
I have the same issue. It seems like the website is completely shut down. This company sucked anywway, but I did have some unused certificates on there.