Google's been busy enhancing. I subscribe to the Google Docs blog and recently added the Google Docs widget/tool/accessory to my Gmail. So over in the left column I have a list of docs currently hosted in my Google Docs section.
So if I ever need to forward/attach a document to an email, there it is. I avoid the "click to attach-browse-find folder-find document-click ok-click ok again-wait for uploading-click send" process.
But for those paranoid conspiracy folks, you may not want to indulge in this wonderful feature, unless you replace certain keywords in your manifest doctrines.