Need to be able to remotely add torrents to your secure machine at home? Don't want to expose any ports to the world in order to accomplish that?

Solution: Use Dropbox and uTorrent.

How? Setup uTorrent to automatically download any torrent files found in your Dropbox folder (like the picture says). After that, any torrent files that you put in Dropbox - from any computer where you set it up - will begin to be downloaded. Oh, the joy :)