The Codex is experiencing intermittent problems today. One suggestion when this occurs is to use google and a cached version of a page when this happens.
A few other resources:
http://www.tamba2.org.uk/wordpress/docs/ (note, these have not been updated since 2.0's release, to my knowledge)
http://guff.szub.net/wordpress/template-tags/ (again, not updated since 1.5)