I really don't understand how Google Docs (GDocs) gets taken seriously as a competitor to Office. (And I'm depending on GDocs for my own strategic purpi.)
The formatting capabilities of GDocs are abysmal, not much better than a typewriter with a few fonts and four styles (paragraph, headers 1 through 3). Oh, and some poor table support.
Office Web will blow them away for serious document production needs.
Perhaps there are lots of non-serious document users out there, and perhaps GDocs serves them well. It's hard to know.