John Naughton links to Writely, an online word processor.
This is the sort of thing I have discussed earlier, that Google could provide after their link up with Sun, using the OpenOffice.org applications as a base.
This might be useful for something I am working on, where three people are editing the same file. At the moment it is a Word file being emailed around, and obviously version control can be a nightmare.
The Writely folk also maintain a blog.