Siganture are Blue Zoo, Shula's, Il Mulino & possibly Kimono's - not positive but there's a list on the S/D thread. I've used the
AAA discount at Picabu & The Fountain -both very good food. We love the Picabu food court - it's open 24/7 & has a wide variety of items priced the same or better than Disney CS. The Fountain has great made-to-order burgers, shakes & ice cream for less than a Disney TS.
You can get a bargain on gift certs from restaurant.com for the signature places at S/D also for Garden Grove at The Swan. Just watch the fine print - I think they are all dinner only, with a $100 check minimum. You cannot used the Garden Grove one for the character breakfast there. We used one last week, not at S/D, but at DTD. $50 House of Blues cert for $6 - not bad!
We did
DDP once & never again. We spend far less eating on our own, and like someone else said, we felt obligated to order app, dessert, etc when on DDP (we paid for DDP, it wasn't part of
free dining) and we wasted a lot of food which I hate doing. Add to that the fact that we felt tied down to our ADR's every day, and sometimes I just like to wing it - we couldn't do that on DDP.
I agree the food choices & quality are much better at S/D then in WDW as a whole.