Anyone can create a Google account for free, log in, and read and/or edit pages listed in google docs. Check out my document for a lesson plan I'm currently working on for my critical information literacy project: http://docs.google.com/Doc?id=df68pzp9_2g9jd7b
Another cool thing to do with Google Docs would be having students use the spreadsheets section to upload information they are doing on a telecollborative project. The first thought that comes to mind, is that of comparing science investigation data. How great would it be for the students to enter their classrooms data, then review a different class's information and then do some analysis. The advantage of using this technology is that it would be "live" being saved and edited at the same time but from different locations.