Keeping high anonymity on the web is really difficult these days but thanks to numeric Internet proxies we can keep ourselves secure and safe on the Internet for as long as we want. Also if your Internet Service Provider has blocked any sites like Orkut or MySpace you can bypass the firewall using proxy servers.
find full details and info on below link.....
http://www.sizlopedia.com/2007/05/16/how-to-use-proxy-servers-to-bypass-firewalls/