The restaurants in the Orlando (or any) Entertainment book, can change every year. Saving $ with it depends on how often you eat and play offsite.
The current airline discounts are for United. It also has car rental discounts for,
Avis,Hertz, National, Budget and Alamo. (But, I almost always find the best discounts with Dollar using the codes found on mousesavers.com)
It CAN save you lots of $ if your trip is lengthy and you plan wisely. In May 2000, DH and I saved $258 on a trip of 16 days. In that year, the only onsite offering was a 2 for 1 at the Maya Grill in Coronado Springs. But we also ate in the WDW hotel restaurants on Hotel Blvd. We used it for mini golf, dinner shows, and lots of other local offerings in the Orlando area too.
Before flying home to NJ, I tore out all the national chain coupons. (Burger King, KFC, Wendy's, Arby's, Subway, etc) Then I left the book on the back seat of the rental car at the airport, in hopes that someone else might use it too.
I just checked on entertainment.com and the 2004 offers include: four offers for fine dining at restaurants on Hotel Blvd.
Arthur's 21 and Outback in Wyndham Palace - Baskervilles in the Grosvenor Hotel and Giraffe Cafe at the Hotel Royal Plaza.
Also, Trattoria del Porto at the Portofino Bay Hotel @ Universal. Plus Arabian Knights and Capon's Dinner Theaters. And oodles of other places around the Kissimmee, Lake Buena Vista and Orlando areas.