Mario Kart Double Dash:Official site. Provides pictures, downloads, information about the racers, karts and courses.
GameFAQs: Includes information, reviews, FAQs, guides, hints and a message board.
GameWinners: Provides secrets, hints, and time trial records.
Mario Kart Double Dash: Offers cheats, guides, FAQs, news, reviews, and a message board.
Mario Kart Time Trials: Information, tips, and time trial records.
UnderGroundOnline: Includes a selection of secrets and unlockable bonuses.