As a long time Google Docs user, this is great news.
We have learned time and time again that you shouldn't trust your data to one service, so easy exporting of your documents is a great feature, and should be done on a regular basis!
And if you want to automate it, Backupify.com can do regular backups to S3 from Google Docs and other online services. (Note: I have no affiliation except as a customer.)
We have learned time and time again that you shouldn't trust your data to one service, so easy exporting of your documents is a great feature, and should be done on a regular basis!