kproxyswitch is a simple bash script, which makes setting the proxy server easier (which then applies to Konqueror and all other applications that use the global proxy setting).

If you have to change proxies from time to time - or switch the proxy off and on again - you'll like the possibilty to bind this script to a keyboard/menu/... shortcut and thus be able to switch the proxy faster than going through the menus of Konqueror or KDE Control Center.