Firstly my experience of Google Docs. I use this all the time - its a terrific resource for when I need to back up work. I use it a lot for study, I'm paranoid that I'll lose my eee pc or, that files will crash, so I save all my essays on google docs. I've also used it for collaboration at work - where a group of people from partner organizations contributed to a funding application.
Secondly, I had a look at Google Books. That's an interesting way to while away the time. It doesn't do it for all books, but for some it shows you a map of locations that are mentioned in a book. I checked that for a Melbourne based book called The Slap that I read recently, but they didn't have the map bits. It also brings up online reviews for the books, and other online references such as in wikipedia. Some books have a preview too.

