It seems like all WDW-owned table and counter service restaurants are on the DDP. Only ones not on the plan are ones that are not owned by Disney, like BW and DTD restaurants-Is this correct?
However, many restaurants that are not owned by Disney accept the DDP. Several restaurants at DTD accept it. All the Boardwalk restaurants accept it (some of those are Disney-owned). A number of the Epcot World Showcase restaurants are not owned by Disney, and most of them accept the DDP.
In the sticky thread at the top of the board, there is a 2008 Dining Plan FAQ which has a link to the 2008 DDP brochure. This lists the currently participating restaurants.
You can also find a 2008 Disney Dining Plan brochure at www.disneyworld.com. I don't have the exact link but you can put in Magic Your Way Dining Plan in the search engine and it'll come up.