One of the main complaints I get about Google Docs is that it doesn't have the same functionality as Word 2003/2007/2010.
I agree.
I've also been told that Google Docs is as slow as molasses if you are trying to collaborate on a document in the middle of the school day.
I agree.
So on this fine, sunny Sunday morning, I have found Zoho Writer--another online collaborative tool that is very similar to Google Docs--except is has a greater level of functionality--and students can still 'share' the document with you and their partners.
The next time you assign a collaborative writing piece, ask half of your class to use Google Docs and the other half to use Zoho Writer.
Then.....discuss!