What are the chances that all of these applications working over the web will be attacked by viruses on a daily basis?
I see this most likely as a web based word processor that a company might set up and run within their intranet, possible also a stand alone to the desktop (maybe using a small webserver typical with apps like 'webmin'). There will probabally be an office.google.com but I dont think that is the full scope of this.