I've been testing the free beta of Microsoft Office Live online. There is also a $5.99 iPhone app, which I haven't tried.

The free Office live account includes 5GB of storage, The editing functions of existing docs seen to work well so far.

So far this seems like a nice alternative to Google Docs

I'll add more as I discover and explore this cloud interface.

If you have any input on this site feel free to add in to the thread.