Here are some good links for people who may be interested in combinatorial game theory.
Topic description and detailed bibliography, by A. Fraenkel.
about CGT history written by R. Nowakowski.
Some reference books:
Lessons in Play
On numbers and games
A (rather recent)
of open problems.
Combinatorial Game Suite
, a Java program developed by Aaron Siegel, which allows to compute the game values of any combinatorial game.
Some good pages of Combinatorial Gamers:
(a blog dedicated to CGT with frequent update)
(page devoted to octal games)
(interesting stuff about misere theory)