AMG: Johnny Mercer: Includes biography, collaborators, and discography.
IMDb: Johnny Mercer: The artist's filmography.
Johnny Mercer Educational Archives: Includes biography, photographs, FAQ, films and shows, sheet music covers, lyrics, discography, and MIDI files.
The Johnny Mercer Foundation: Non-profit organization devoted to preserving and celebrating the Great American Songbook in the tradition of Johnny Mercer. Includes biography, song list, audio, events, and projects. [Flash required]
Todd Peach's Johnny Mercer Page: Collection of song lyrics.