Sum 41:Official site. Includes tour information, audio clips, lyrics, images, biography, and contact information. [Flash Required]
Allmusic.com: Sum 41: Biography, discography, and audio clips.
Launch.com: Sum 41: Biography, discography, news, and videos.
Rolling Stone: Sum 41: Biography, discography, photos, trivia, articles, charts, videos, and links.
VH1: Sum 41: News, links, music videos, audio samples, and a biography.