The source code is available for download right now from the Android Open-Source Project git servers, though Queru warns that it is a rather hefty file and can take some time to download. If you plan on checking out the source code yourself, I recommend waiting a bit for the servers to calm down.
Clicking on the link from the original post sent me straight to a 404 page so it might be a while before people can actually get their hands on the full file.
Interestingly, the code includes the previously unreleased source for Android 3.0 (Honeycomb). Queru admits that Honeycomb was unfinished and urges all developers to ignore it in favor of Ice Cream Sandwich.