http://www.onspeed.com/en/ - a similar thing.
The other option, is to hunt down open proxies, but the publicly listed ones are likely to overload and be very slow.
JAP - http://anon.inf.tu-dresden.de/index_en.html - a "swarm" anonymizing proxy
The Onion Ring - http://tor.eff.org/ - A bit fiddly to set up, and a similar idea to JAP
Under the old "Proxomitron" (you'd need the fixed update, the last version ever), you could also pool a list of known proxies, and rotate them.
I'm guessing that you don't actually need an anonymizing proxy, as your problems (from a "big brother" regime) are before the proxy - once you are outside, it doesn't matter if the destination sites have your IP, as their IP is hidden from the oppresive routing