GameFAQs - Includes information, guides, secrets, downloads, reviews, and a message board. - http://www.gamefaqs.com/portable/gbadvance/data/914980.html
GameSpot - Includes information, news, screenshots, links, movies, previews, and a review. - http://www.gamespot.com/gba/rpg/marioandluigi/
Nintendo - Official publisher's site. Screen shots, game description, features, and player ratings. - http://www.nintendo.com/gamemini?gameid=m-Game-0000-1854