My literacy Specialist and I are going to start working on some collaborative creative writing projects using online word processors this semester.  Because of this, I've been researching different options.  I've looked at Sakai before, but I find Google Docs more user friendly.  The Google Docs website is much more attractive (less junk), and I find it more intuitive to navigate.  If you want teachers and kids to use it, I would say "Less is More."