FastProxySwitch 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. Proxy now can be changed from the system tray within a few clicks. No more need to open a lot of windows to change proxy settings (Tools -> Internet Options-> Connection-> LAN Settings).
FastProxySwitch works with both configuration scripts and proxy servers. The program will read your existing proxy settings for all existing connections the first time you start it. Using FastProxySwitch you might switch proxies, change the current active proxy setting. If you'll change active proxy settings using FastProxySwitch, it will be applied to IE and system immediately.