Entertainment

• Chess Federation of Canada/Fédération canadienne des échecs

• Comics
  • Print Comics
    • Calvin and Hobbes
    • Dilbert
    • Doonesbury
    • For Better or For Worse
    • FoxTrot

  • Web Comics
    • 
      [My personal favourite!]

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    • the Starry Ones

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• Science Fiction and Fantasy
  • Baen Books
  • NESFA
  • Science Fiction Book Club
  • Science Fiction Resource Guide
  • Tor Books
  • Uchronia: The Alternate History List

Macintosh

• Apple Computer
• Everything Macintosh
• Info-Mac archive
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Mathematics

• American Mathematical Society
• Association for Symbolic Logic
• Canadian Mathematical Society/Societé mathématique du Canada
• SFU History of Mathematics
• International Mathematical Union
• Mathematical Association of America

TeX

• Comprehensive TeX Archive Network
• OzTeX
• TeX Users Group