This page is devoted to a wonderful game of Go. The board it is played on is called GoBan.
Read about game history. Article on Wikipedia. Introduction to the game.
Interactive tutorial available:
Download a computer game GlGo and GNUGo on Panda.
Online versions of the game are available at 361points. You can play against GnuGo engine here. Atari-Go is available here. Some problems for solving are available here.
Some playing tips & proverbs:
Below is some Japan-related material.
Learn how to sit (Seiza).
There is a company in Australia that builds tatami mats.