You can setup your own proxy server on Google App Engine with GAppProxy for FREE. GAppProxy is written in Python and run on the Google App Engine. The greatest advantage of the application is you do not need a dedicated server and the speed is very fast.

First of all, you must register a Google App Engine account and create an application as GAppProxy. Then go to http://code.google.com/p/gappproxy/downloads/list to download GAppProxy. Run the gui.exe to start your FREE proxy server, configure your web browser with HTTP proxy set to 127.0.0.1:8000. Now, you can access the internet via the proxy server