http://workspace.officelive.com/ went live by Microsoft but Google Docs might defend this strategy soon or should we wait another independent party?

I recommend you to try it but first try to close any Microsoft office document and then try this cool feature Share your screen and be assured that this might be the future of Software as a service where all your desktop properties can be shared privately or publicly and accessible from any Internet connected device (mobile, pc, moonlight computers).

Microsoft Office Live Workspace Beta
An online extension of Microsoft Office
Sign Up Freefor service and sweepstakes*Watch the video
Anywhere Access

Save 1000+ Microsoft Office documents in one place
Access them from almost any computer with a Web browser
No more flash drives or sending yourself documents via e-mail
Learn more
Share with Others
Invite people to your workspace
You control who can view, comment, and edit your documents
Stop manually merging versions from multiple people
Learn more
Extend the Microsoft Office Experience
Open and save files directly from Word, Excel, and PowerPoint
Synchronize contact, task, and event lists with Outlook
No need to learn a new program
Learn more