Julian Simon (1932 - 1998): Short bio and annotated bibliography.
Julian Simon articles: Several articles from Liberty Haven's site.
Simon's "Immigration: The Demographic and Economic Facts": Describes the positive effects of immigration.
The Doomslayer: Wired magazine article on population economist Julian Simon.
The Ultimate Resource II: People, Materials, and Environment: Simon's magnum opus in full e-text. (the "II" signifies the second edition)
Works by Julian Simon: Many of his books and articles available in e-text.