If you go to https://docs.google.com/demo/, you can start editing a document, a spreadsheet or a drawing and share the links with other people, so you can collaborate in real-time. Google says that the documents are only available for 24 hours from the time they are created.

It would be nice to create documents in Google Docs or upload files to Google Docs without associating them to a Google account. Maybe they aren't very important or maybe they include important information that you aren't allowed to post.
{ via Matt Cutts }