Thank the gods for the EFF. They released a system developed in conjunction with the U.S. Navy that anonymise your network traffic.
The system is called Tor and is free as in freedom. It works on Mac OS X, Linux and Windows. It is based on a concept called onion routing. It basically works by having a local proxy-server that connects to a Tor server through TLS, this server in turn routes the packets forward to another router and so on, until it reaches the destination server.
This is a great thing for freedom and human rights, since no government can track or eavesdrop on the communication that an individual is conducting.