Writely has a a beautiful interface. It also gives an indication of how where information will live in a Web Office world. For many documents, it will make more sense to post them up on to some kind of server. The document is then stored in a searchable format, it's accessible by a large audience, and you can include access control tools, edit tools, and feed back tools. I am not sure how far it makes sense to take the document metaphor, however. It could be that in the Web Office framework, most documents are supplanted by Blog posts and Wiki entries. Regardless, the folks at Writely have put together a beautiful interface, with a good indication of what these web based tools can look like.