Any reason you’re not redirecting to a page which explains that the WordPress documentation is down and gives an estimate of when it will be back up? People who just downloaded WordPress for the first time will have a hard time installing it with no instructions.
I am also in the weekend-upgrade-business, so: life without Codex is stale …–just kidding, or, just a way to say ‘thank you’ to the people working on the Codex: we need you, appreciate your engagement!
Those of you looking to upgrade from WP v1.2.x to WP v1.5 (including upgrading your v1.2.x template to a v1.5 theme), should read Podz’ tutorial. The Codex upgrade instructions are based off of his: http://www.tamba2.org.uk/wordpress/upgrade/