I just posted a binary of Radar Forwarder version 1.0. Radar Forwarder is a small application that handles those rdar:// URLs to Apple Bugs and forwards them to another URL. By default, it’ll forward to the Open Radar website. The application is a faceless background application that is launched on demand and quits after being idle. Once you click past the initial “this application was downloaded from the Internet” warning, it should run transparently and use no resources when not in use.
The application is packaged inside a preference pane due to one snag: if you’ve installed the iPhone SDK, MobileSafari included with the simulator registers for rdar:// links, for some reason. The preference pane allows you to chose which application handles rdar:// links. It also allows you to set the URL to forward to, if you’re so inclined.