The Tor Browser bundle makes it easy to use Tor without having to install any software on your PC. You can even slap it on your jump drive to use any where you go.
And it is as easy as — download, extract, run!
From the site:
The Tor software protects you by bouncing your communications around a distributed network of relays run by volunteers all around the world: it prevents somebody watching your Internet connection from learning what sites you visit, it prevents the sites you visit from learning your physical location, and it lets you access sites which are blocked.
The Tor Browser Bundle lets you use Tor on Windows without needing to install any software. It can run off a USB flash drive, comes with a pre-configured web browser and is self contained. The Tor IM Browser Bundle additionally allows instant messaging and chat. If you would prefer to use your existing web browser, install Tor permanently, or if you don’t use Windows, see the other ways to download Tor.
The bundle includes portable Firefox and also Pidgin IM software with the IM Browser bundle (separate download).
Check out the Tor Browser page for downloads and instructions.
If you like Tor you might want to check out Take Control of Tor With Vidalia, Browse Anonymously with XeroBank, and using Anonym.OS to encrypt and anonymize traffic.
Freenet is a relatively new P2P project in which members act similar to that of a cluster, donating hard drive space and bandwidth. It is similar to the Tor network in the fact that connections are encrypted and re-routed through other members of the network.
“It acts more like an Internet within an Internet.”
What’s different about Freenet is that you also dedicate parts of your hard drive for file storage. What is even more interesting is that you have no control over what is stored in your ‘data store’. Less popular files are deleted to make room for more popular files. The files are encrypted so that you ‘might’ not be held responsible for what lies within your data store.
Freenet is not only for storing files, but also allows you to create Freenet websites called ‘Freesites’. Also usenet, email, and more is possible on the Freenet.
Freenet is open source and runs anywhere Java runs. Windows, Linux, or Mac should work fine. After installing the interface is accessible through a web browser. Remember, Freenet is still in alpha stage so there may be some bugs.
Read more and download at the Free Network Project website.

AnonymOS is a live CD based on OpenBSD that provides a hardend linux OS where all inbound traffic is denied and all outbound traffic is encrypted/anonymized. The live CD implements the tor network to achieve this.
From the site:
Like sand through the hourglass, so are the vestiges of our privacy. From increased governmental surveilance to corporate content restrictions and data brokers, what you do, where you go, and who you talk to is of more interest to more people every day.
Anonym.OS is an OpenBSD 3.8 Live CD with strong tools for anonymizing and encrypting connections. Standard network applications are provided and configured to take advantage of the tor onion routing network.
Anonym.OS was first suggested by dr.kaos at Interzone 4 in Atlanta, March of 2005. Nearly a year and a lot of marathon coding sessions later, it’s a reality and was released by elmore, fade, arcon, dr.kaos, digunix, atlas and beth of kaos.theory at Shmoocon 2006.
I love the acronym in the presentation:
Hardend, Optimized, Transportable System for Encrypting and Anonymizing Traffic
Get Anonym.OS @ SourceForge