I've been using googlecl for quite a while to edit google docs in vim, but there are bugs/issues, specifically ongoing issues with newlines:

http://code.google.com/p/googlecl/issues/detail?id=301

When this post's site is back up, it will be interesting to see if a) their method is as simple as googlecl and b) if it utilizes googlecl, whether that newline issue has been addressed.

EDIT: ok, saw the google cached version. Still subject to newline issue as far as I can tell.