Free IE Proxy Changer
Proxy Changer is a windows program that runs in the system tray and allows you to quickly change between proxy servers, or to quickly change proxy settings in Internet Explorer. Simply setup proxy servers in the program and set one as default and one as an alternate to be able to quickly switch between them.
Proxy Changer can also enable and disable proxy, set to automatically detect settings, or to use the automatic configuration setting, all from the system tray within a few clicks. Ideal for users who use a laptop between home and work, or for anyone who needs to quickly and effortlessly be able to change a proxy setting in IE. All settings are changed on the fly without the need to restart Internet Explorer.