Association Française d'Approximation  
   The subgroup of SMAI concerned with approximation and representation of curves and surfaces. Features conferences, workshops and bibliography.
   http://www.infres.enst.fr/~afa/

Bibliography in the Approximation of Curves and Surfaces  
   Mainly in English, some French.
   http://www.infres.enst.fr/~afa/biblio.html

Approximation Theory  
   Notes for courses given by Carl de Boor, Madison. (PS)
   http://www.cs.wisc.edu/~deboor/ma887.html

Approximation Theory Network (AT-NET)  
   Publishes a Bulletin and lists journals, theses, people, events and other links.
   http://www.uni-giessen.de/www-Numerische-Mathematik/at-net/

Open Problems in Constructive Approximation  
   Articles in PostScript format.
   http://www.cecm.sfu.ca/personal/pborwein/CA_MOSAIC/PROBLEMS/A_PROBLEMS.html

A Short Course on Approximation Theory  
   Lecture notes for a graduate course by Neal Carothers, Bowling Green State University. (DVI,PS)
   http://personal.bgsu.edu/~carother/Approx.html

History of Approximation Theory  
   Articles and web resources developed by Allan Pinkus and Carl de Boor.
   http://www.math.technion.ac.il/hat/

NZ Approximation Theory Group  
   Members, meetings, visitors and links.
   http://www.math.auckland.ac.nz/~waldron/NZATG/

People in Approximation Theory  
   Amos Ron's list of links.
   http://www.cs.wisc.edu/~amos/atpeople.html

A View from the Back of the Envelope  
   About approximation and the fun it enables. Includes examples, exercises, and links to help grasp concepts such as measurement, scale and magnitude. Sections include simplifying numbers, exponential notation, Fermi problems, using your body as a ruler, a
   http://www.vendian.org/envelope/

Approximation and Imaging  
   Université de Pau. Research topics, faculty, publications, meetings.
   http://www.univ-pau.fr/~cgout/app.htm

Approximation People  
   A list of home pages kept at the University of Erlangen.
   http://www.mi.uni-erlangen.de/at-net/homepages.html