This might be of use to some people looking for online storage - http://www.viksoe.dk/code/gmail.htm
Edit: Just realised this maybe be very old news, but i guess some people may have not seen it yet.Because the Gmail files will clutter up your Inbox folder, you may wish to create a filter in Gmail to automatically move the files (prefixed with the GMAILFS letters in the subject) to your archived mail folder.