[gentoo-server] Setting up something similar to anonymizer

[Kurt Lieber]

For those unfamiliar with anonymizer, it's essentially a web-based proxy
that allows a user to enter a web address in a web form and have that site
displayed in a frame.  This is done to prevent web sites from identifying
you personally.

However, another thing it's useful for is bypassing site filters that some
corporations have in place.  

So, is there anything similar to anonymizer out there that can offer
similar functionality?  (that I can set up on my server) Is this something
squid + a PHP page or three can do?  I don't care about the anonymous
aspect of it -- I simply want to be able to browse any web site, regardless
of whatever site filters may be in place at the client site I may be
working at.

thanks

--kurt