Game Archives

Commented professionals and amateurs games
Commented Go games by Alexander Dinerchtein, 1-dan professional. Lot of free samples
http://www.go4go.net/v2/modules/alex/

egoban.org
A community featuring web-based tools. Also has FAQs.
http://egoban.org/

Fuseki Info
Online professional Go games database (more than 35,000 games). Contains game records, game lists, fuseki and joseki trees.
http://fuseki.info

Go4Go.net
Go game collection of professional game records with a search engine. An English version that runs independently of the go4go.net main site in Chinese.
http://www.go4go.net/v2/

Professional Games in Smart Go Format
A collection of .SGF format games available for download and study. (quite old)
http://www.cs.ualberta.ca/~mmueller/go/games.html