There was a way of using ftp to upload large files and use gmail as a virtual hdd. Not sure about now.
I don't "know" the rules, I just know where to find them. It's easier to look for answers in the TOS and Guidelines than it is to ask here and wait for peoples' opinions. Why do you think I live in illinois?!
Ok you're really good at finding rules then. You good rule finder. Texas doesn't even have any!!!! I just got a new goat. Edit. The goat thing is a pet and totally unrelated.
I have seen several of these programs around the net. Here is one for example: http://www.viksoe.dk/code/gmail.htm I have not tried it but seems to be do what you are trying to do.
You can use Gmail like that. But I read somewhere that they limit your bandwidth (think it was like 2Gb a week or something)