Carry On Line: William Hartnell: Biography, filmography and a photograph.
Citizen Of The Universe: The William Hartnell Fanlisting: Lists fans and their web pages, with a poll, desktop wallpaper and pictures.
I Felt Like the Pied Piper: Fan page offering a selection of quotes given by the actor between 1963 and 1975.
IMDb: William Hartnell: Biography, filmography, a message board and links.
Wikipedia: William Hartnell: Article providing biographical information, a career overview and examples of his occasional errors made during the filming of 'Doctor Who'.