Several months ago, a hack was posted that allowed you to use your Gmail account as a personal file server, accessible from any PC that you wanted (as long as it had internet access and the hack installed).
Gmail made the hack inop when they changed something inside of Gmail. Probably did it on purpose, much like Microsoft's famous "DOS isn't done until Lotus doesn't run" scheme in the late 80's.
Well, now it's back. The only limitation is that this time, it's only for Windows XP.
All The Best,