Recently I have researched on bypassing internet filters. Mainly bess
and websense because their products are employed at my high school and
local library. The first and easiest way to bypass the filters is to
simply use a proxy that you find in any proxy list across the internet
in your internet options in your browser. These proxy lists can be
found with a simple google search for "proxy lists".

The most common way to bypass the filters is with some sort of web
proxy. The one I use is ran by Trilogy Group at http://fearweb.net and
is scripted in php. The web proxies do the same thing as the IP proxies
except they display the information requested with a programming
language rather than just your browser. Web proxies are scripts that
can be set up on a web server. If you have a web server that you would
like to run a script on, I would reccomend "CGI-Proxy" by James
Marshall. That script can be found at jmarshall.org.

I would reccomend the second method because most web proxies are kept
under password protection so they arent blocked quickly. The IP proxies
tend to be slow and die quickly.
Hope this is helpful,
Cyber Vision X