Do you use Google Documents?

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For those who have a Gmail account, do you use the Google Documents function? It allows you to have documents (like those created by Microsoft Word) and spreadsheets that you can access from any computer with internet access, through your Gmail account. I know this feature has been available for a while, but I just started using it yesterday. Among other things, this means I don't have to write down my to-do lists on paper any more! Shopping lists, I'll still have to write down, but just the list of reminders of things to do when I get home can go into a Google Document, and then I can look at them from my home computer. Anyone know any particularly useful features of Google Documents that a new user might not have discovered yet? Share them here! :)