Aviezri Fraenkel
A comprehensive bibliography on combinatorial games; several papers about combinatorial games; and information about where to publish such results.
David Eppstein - Combinatorial Game Theory
Many up-to-date links, and a short introduction.
Dice Theorem
How many ways are there of throwing n indistinguishable dice each with m faces?
Elwyn Berlekamp - Combinatorial Game Theory
Elwyn's research in the field, including several papers.
Erik Demaine's Combinatorial Games
Research on pushing blocks, Clickomania, Phutball, and sliding coins. Survey paper on algorithmic combinatorial game theory.
Games that interest John Conway
Clever Games for Clever People, from the book On Numbers and Games.
Jeff Erickson - Mathematical Games, Toys, and Puzz
Links to several game theorists and actual games, plus a brief introduction. Also a couple of papers on game theory, about Toads and Frogs and Sowing Games.