Just found this new App and I thought you bods may be interested.
It apparently will diagnose even the 3 amegios problem via Wifi using your ipod or iphone

DevToaster - Rev - iPhone app development, Great iPhone apps, and more

I'm not into electronics, iphones or ipods but it all seems possible to me

Peter
link for Discovery 3 testing on youtube [nomedia="http://www.youtube.com/watch?v=pjC4iqICp1g&feature=related"]YouTube- OBD2 ...WIFI AND IPHONE ..TESTING IN DISCOVERY 3[/nomedia]