links for 2008-04-21

• What will you do for Earth Day '08?
  지구의 날
  (tags: google earthday)
• Earthday
  (tags: earthday)
• Structure and Interpretation of Computer Programs, Video Lectures
  (tags: lectures programming lisp)
• Welcome to the SICP Web Site
  (tags: lisp books)
• TurboGears: Front-to-Back Web Development
  (tags: framework web programming)
• The Roots of Lisp
  (tags: lisp programming)
• Actor model - Wikipedia, the free encyclopedia
• Recursive Functions of Symbolic Expressions and Their Computation by Machine, Part I
• The Original 'Lambda Papers' by Guy Steele and Gerald Sussman
• How to Design Programs