http://www2.writely.com/

The Web Word Processor
...that's now part of Google.
· 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