'Hamachi', and 'Drive Manager'

Hamachi

Hamachi is a zero-configuration virtual private networking application. In other words Hamachi allows you to arrange multiple computers into their own secure network, over the Internet, just as if they were connected by a physical network cable.

http://www.hamachi.cc/

Drive Manager

Drive Manager can be placed on your desktop to be used as an alternative to My Computer. It can also be used to hide drives from explorer. Double clicking on a drive will open it in explorer. The current version can create substitute drive letters for local folders.

http://www.alexnolan.net/