Privoxy is a web proxy with advanced filtering capabilities for protecting privacy, filtering web page content, managing cookies, controlling access, and removing ads, banners, pop-ups and other obnoxious Internet junk. Privoxy has a very flexible configuration and can be customized to suit individual needs and tastes. Privoxy has application for both stand-alone systems and multi-user networks.
Privoxy is based on Internet Junkbuster (tm).
Another from Robert Waldner,
Great for those of us in environments where not everyone runs Mozilla Firefox (yet ;) ), and can easily be chained before your local squid installation.
More information on this package can be found on the Debian web site.
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Now available in RSS and ATOM flavors too.