Dots and Boxes - Dots and Hexagons
   Reviews standard rules, and introduces the analogous game on a hexagonal board.
   http://www.drking.plus.com/hexagons/dots/

Dots-and-Boxes Analysis
   Analysis program and results.
   http://www.cae.wisc.edu/~dwilson/boxes/

Eric Weisstein's World of Mathematics: Dots and Boxes
   Entry with rules, basic strategy, and references.
   http://mathworld.wolfram.com/DotsandBoxes.html

Postings from rec.games.abstract about Dots and Boxes
   Includes a survey of the mathematical and computational literature.
   http://www.math.niu.edu/~rusin/uses-math/games/other/dots_n_boxes

Talk by Katherine Scott: Loony Dots and Boxes Endgame
   Streaming-video 30-minute talk held at MSRI during the Combinatorial Game Theory Research Workshop, July 24-28, 2000. Describes a particular type of endgame which arises frequently in practice and can be solved in polynomial time.
   http://www.msri.org/publications/ln/msri/2000/gametheory/scott/1/