What is the best proxy
Some of the best proxies include http://duinflora.com, http://2008arcade.com and http://notimeforschool.info. When selecting a proxy, you may want to consider the security of your IP address and how well you can bypass your work/school web filter.
It depends on what protocol you are trying to proxy. Privoxy is a popular non caching web proxy. There are also other ways to do it such as creating a SOCKS proxy thru an SSH connection. It really depends on what you're trying to do.