I really don't like the new version of Google documents which creates new docs as on pieces of sized paper - what you see in a Word editor. I love the old one like webpages, without pages or margins. I want my content to be as wide as my computer screen.
Google has an official way to go back the old style at the bottom of this help page: https://docs.google.com/support/bin/answer.py?answer=176442.
The solution is to use this link to create new docs, in the old style: https://docs.google.com/?action=newdoc