Here is example of this how autoupdate feature works. You can see that this what is in OpenOffice.org on the right after each save of document is moved to Google Docs [on the left]:

OOo2GD lets you to keep connection between your document in Google Docs and this what you are editing in OpenOffice.org.

This works in this way that after each save of document to local disk [by CTRL-S for example] OOo2GD will upload new version of document to Google Docs.

To do it you need to import document from Google Docs with checked Autoupdate checkbox or to export your document to Google Docs with this checkbox checked.