Filesystems on GMail
A couple of weeks back, I had sent an excited email to a few friends on GMailFS - a mountable Linux filesystem on GMail. This allows you to use your GMail account as a storage medium.
Quite recently, I stumbled upon a similar thing for Windows. The 'GMail shell drive extension'. This literally adds a new drive to your computer under the 'My Computer' folder, where you can create new folders, copy and drag n' drop files.