yeah there is a rust warranty! Here is what I found for 04, but good luck getting them to honor it.
Basic 3 year / 36,000 miles
Drivetrain 7 year / 70,000 miles
Roadside 7 year / 70,000 miles
Rust 5 year / 100,000 miles
Basic Warranty: The basic warranty covers everything except items that are subject to wear and tear or replacement in the ordinary course of vehicle ownership, such as oil and air filters, wiper blades and brake pads. Tires and batteries are often excluded, but usually have their own warranty provided by the manufacturers of those items. Emissions equipment is required by Federal law to be covered for five years or 50,000 miles.
Drive Train Warranty: In some cases the drive train warranty continues after the basic warranty has expired. This part of the warranty covers most of the parts that make the vehicle move, including the engine, transmission, drive axles and driveshaft. Like the basic warranty, consumable parts such as hoses and belts are not covered. However, most of the internal parts of the engine, such as the pistons and bearings, which are also subject to wear and tear, are covered by the drive train warranty.
Roadside Assistance: Many manufacturers provide a service that will rescue you if your car leaves you stranded, even if it's your fault. Lock yourself our of your car? Run out of gas? Got a flat tire? A call to the manufacturer's toll-free number will result in somebody showing up who can help you out. There is a huge variance in these programs so check ahead of time to see what is covered and what you will have to pay for.
Rust or Corrosion Warranty: Rust or Corrosion Warranty: This warranty covers the vehicle's sheet metal, and protects you from rust and corrosion that are severe enough to cause a hole - surface rust is not covered. However, if you keep your car washed and waxed rust shouldn't be a problem.