The best buffet in Las Vegas, hands down. They offer a lot of food choices, the wait staff is quick, plus we went on a Friday night around 6pm and were seated immediately. It is under $30 a person, which is a great deal.
Those of you in the Chicagoland area, the Four Winds Hotel and Casino in New Buffalo, MI is the closest thing you'll find to the Carnival World buffet outside of Vegas.