Writely

Writely is a part of Google.But you have not to register with Google to use the site.It allows you to edit documents online with whomever you choose, and then publish and blog them online.
you can:
^ Upload Word documents, OpenOffice, RTF, HTML or text (or create documents from scratch).
^ Use simple WYSIWYG editor to format your documents, spell-check them, etc.
^ Invite others to share your documents (by e-mail address).(nice)
^ Edit documents online with whomever you choose.
^ View your documents' revision history and roll back to any version.
^ Publish documents online to the world, or to just who you choose.
^ Download documents to your desktop as Word, OpenOffice, RTF, PDF*, HTML or zip.
^ Post your documents to your blog.
It seems like a good service.