Wikipedia: Sesame Street*Cool Site* - An article profiling the series Sesame Street, its characters, guest stars, history, specials, merchandise, spin-offs, and international co-productions.
Hooperfan's Page - A tribute to the show's early, classic years. Includes photographs and music, as well as a transcript of "All About Sesame Street", a rare 1971 book.
Sesame Workshop - The non-profit educational organization behind the show and related educational outreach.
Sesame Workshop and International Growth - Essay on Sesame Workshop's perspective of where the non-profit organization must go to diversify into other age groups so that its main American division doesn't fail. [PDF]
Sesame Workshop Books - Directory of Random House's collection of Sesame Street books for sale.
Sesame Workshop: Sesame Street - Official site includes games, stories and activities, as well as resources for caregivers. [Requires Flash.]
TV.com: Sesame Street - Show information, acting and producing credits, news links, episode guide.