It really depends on the city you're in. Which part of Cali is OP from?
I agree, in the NC Triangle, there's not much. 49 restaurants within 30 miles is what I'm seeing. Even a chain restaurant, oddly (Macaroni Grill Cary and Raleigh).
Mt. Fuji in Durham is on iDine. I wonder if they still have half price sushi Thursday evenings.
I was in Cleveland once, and I remember that seemingly 1/2 or 1/3 of the restaurants were on iDine. Even some really good places that had great food and a lot of patronage. iDine penetration really depends on your geography.