* Web links that point to http://maps.google.com are redirected to the Maps app. * Web links that point to http://www.youtube.com are redirected to the YouTube app. * iTunes store links (http://phobos.apple.com/etc..) are sent to the iTunes (or App store) app. iPhone apps can also specify their own custom URL scheme (for example, myapp://doStuff). When might you want to use a custom URL scheme for