If you're of the mindset that what you do with your BitTorrent client is your business and not that of people snooping, sniffing, and prying at your packets along the way, ItsHidden offers free VPN server to anonymise your activity.
Photo by Paulpod.
ItsHidden uses 128-bit encryption on the secure tunnel created between you and the ItsHidden servers. Based out of the Netherlands, ItsHidden takes advantage of the legal climate there and doesn't log any activity passed through its servers.
To access the ItsHidden VPN, you need to sign up for a free account and make a small configuration tweak to your respective operating system to enable the VPN. They include step by step instructions for Windows XP; users of other systems will either have to use them as a template or look up the specific steps for their OS. ItsHidden requires no software installation.
During our test run with a large Linux distribution, connection speeds with the ItsHidden VPN enabled were only negligibly decreased from our standard torrent speeds without the VPN in place. Check out the link below for more information and if you know of another service for anonymising your internet activity—torrent-related or otherwise—let's hear about it in the comments.