Yes, it's restaurant dot com, and I've used it for local restaurants here in Monterey, but not yet in Anaheim. Works really well. I've never had the coupon questioned (although sometimes the server isn't aware of the program, and needs to see a manager).
Typically, a $25 off coupon costs $10, a $10 off coupon costs $4, etc. You should be aware that they periodically have discount codes off of that price, though, which makes it very cheap. I participate in a timeshare BBS, and they usually post the discount codes.
The current discount code is PORTION, good for 80% off the above prices, and it's good until Aug 13.
I just used that code to buy coupons for Al Waha and Azteca, both in Garden Grove, for our Sept trip. Got a $25 coupon for each, which cost me a grand total of $4 !!!
Coupons are good for a year, but for any given restaurant, you can only use one a month.
HTH,
Bob