The latest episode of South Park (titled "Margaritaville") features several references to the Grand Theft Auto series:
Cartman: "Of all the times for people to decide to stop buying things, it had to be the week that Grand Theft Auto 4 comes out for Nintendo DS."
Cartman: "I had a dream last night. I was in a field, and I had Grand Theft Auto: Chinatown Wars right next to me. But then the sky went black, and Grand Theft Auto: Chinatown Wars just melted in my hand."
Cartman: "The person you're after might be hard to get, but I can bring him to you - and all I want in return is Grand Theft Auto: Chinatown Wars for handheld Nintendo DS."