Web proxies are frequently used to gain access to web sites blocked by corporate or school proxies. Since they usually hide the user's own IP address from the web sites they access through the proxy. I listed around 100 of proxies here. I wont recommend you to login your mail / dating sites through web proxies. Most of the corporate and schools are blocked some sites like YouTube, Orkut , MySpace Etc.. Here I attaching an excel file with an updated list of proxies. System administrators Don’t worry ! I am not promoting this sites. You can download this Excel file and block more than 1500 proxies.
Similar application : Tor (The Onion Router)