I would reccomend finding some sort of organization that specilizes in these types of things. When the proxy urls are posted publicly they are blocked within weeks if not days. I use a site called Trilogy Group for help around the filters. They never post the proxy URLs publicly so the filters don't see them. Of course to get access to the urls I had to make some forum posts on their site, but I dont mind because ever since August I have been browsing free from the dog. Just check out
Trilogy Group and get a good knowlege of what your up against.