Writely.com is a web word processor which has been recently acquired by Google. Registration is free but not closed for now and will be available after they move to Google systems completely. Here is what you can do with writely.

· Share documents instantly & collaborate real-time.
 Pick exactly who can access your documents.
· Edit your documents from anywhere.
 Nothing to download -- your browser is all you need.
· Store your documents securely online.
 Offsite storage plus data backup every 10 seconds.
· Easy to use.
 Clean, uncluttered screens with a familiar, desktop feel.

Visit : http://www.writely.com for more info.