Dog & Suds Drive In - only a handful around.
St. George & the Dragon - set up like a medieval castle inside, crock of peanuts & pickles on the old wooden tables, shells thrown on the floor. Large fireplaces and a firepit in the center. Predates all the restaurants that followed with the peanut shells on the floor thing.
The Brown Derby - the Gerves (sp?) version, not the Disney wannabee.
Taco John's & Monical's Pizza - central IL staples, Monical's has great thin crust.
Grizzley's Lodge - Chicago sports bar, 12" tvs at every table with the ability to turn on any NFL game playing. Wild Game burgers & food.