This may have been covered elsewhere, but the cost of the CS plan will be $29.99 for adults and $8.99 for kids. Personally, I think this can be a pretty good deal with proper research and planning.
However, I still have an issue with dessert at every meal...are there people out there that really eat dessert every day at lunch and dinner? Perhaps this is just a vacation thing....I might eat dessert once or twice a week usually, and then even when on vacation it's not something we order frequently. The snack credits can be used for plenty of dessert-like options, so it all seems like sugar overkill.
I agree with some of the PPs that the CS is likely to be the "free" dining option in 2009, assuming there is any "free" dining option at all.