Related material:

http://www.newton.ac.uk/programmes/RMA/

and some links for background supplied by andrewcooke (http://news.ycombinator.com/user?id=andrewcooke) when I submitted this a year ago:

http://www.maa.org/mathland/mathtrek_6_28_99.html (short summary)

http://www.maths.bris.ac.uk/~majm/bib/GAFoS.pdf (two page magazine article)

http://www.maths.bris.ac.uk/~majpk/papers/67.pdf (heavier)