Google Docs

Have you ever heard of Google Docs? I didn't until a few weeks ago when we had to come up with a list of literacies for my class. I searched the term "Google Docs" and found the site where you can create a list of just about anything and invite others to help you modify it if you want to. So it is like a closed wiki.

So I was wondering what else I could use this for in my daily life...maybe if I was planning something with others and needed a list of things needed or that needed to be done? Or could email or social networking sites do the same-like Facebook?

Does anyone else have any ideas?