Listed in an arbitrary order.
English-language Go sites, with British connections, are listed separately. This page does not include Go servers or Suppliers of Go books and equipment.
An extensive library of professional game records, player biographies, Go history and current events, articles about Go technique, including much by BGA member Charles Matthews.
This is a Wiki Wiki Web site, meaning that anyone can edit and add new sections to it. Lots of excellent information has already been added.
Collection of links to Go videos (interviews, pro lessons, tournaments, etc).
A collection of Go problems with time trials at different levels.
Huge collection of Go game records, daily updates, pro commentaries
Game records: recording, sharing, commenting, etc.
Go news, commented games, stories, pictures, etc.
Audio Go lectures by Guo Juan, 5p.
http://www.flickr.com/groups/go-game/pool/
Some of the Go photos uploaded to photo site Flickr.
www.di.fc.ul.pt/%7Ejpn/gv/gv.htm
Other rule sets, boards and pieces and so on are listed here.
http://igo-kisen.hp.infoseek.co.jp/news.html
http://godiscussions.com/forum/index.php
A Go discussion forum
http://www.eurogofed.org/calendar/
http://www.eurogofed.org/rating/index.htm
http://www.nihonkiin.or.jp/index-e.htm
The Japanese Go Association. The link above goes to the english part of their site, where you can follow the professional Go tournament scene.
http://www.australiango.asn.au/
Large database of games, but no way to download them. Try gobase.org first.
Ritchie Press spoof book publisher.