Over the weekend, the famous add URL to Google form was offline.

Google posted a known issue about this saying:

Personally, I don’t know if I ever used the add URL form. Maybe I have as a joke or something but never really with intentions of the URL being added. The best way to get a URL added is from a link from a page that gets crawled frequently.

Forum discussion at WebmasterWorld, Google Web Search Help and Google Webmaster Help.

Update: Google has seemed to finally fix this form on October 6, 2010.