Spider Robinson:Spider's official site with weblog, details of upcoming appearances, biography, and new and existing novels.
All About Callahan's: Callahanians: various and sundry related information for all.
January Magazine - Spider Robinson: Interview with the author includes his thoughts about his books, space exploration, Dan Quayle, and Usenet.
Lifehouse - Spider Robinson Book Review: Plot analysis, setting, characters, theme, and structure of some of his novels, and links to similar works by other novelists.
Rah, Rah, Rah: Spider's 1980 answer to the critics of Robert A. Heinlein.
The Semi-Official All-Callahanian Web Page: Information about the author and about Callahan's Place.