Hello
Installed my Dice unit today and it works great (took photos will post later)
I also fitted a video in cable I made and put the aux cable in the dice box from mini jack to phono L/R. I ran all the cables and the iPod cable into the centre console for now until I do something more fancy.
To test the video in and aux sound I plugged in my video camera and set it playing, I put the car in reverse gear (did not get time to do this mod!) and up popped the movie on my video camera on the sat nav screen and out came the audio - perfect.
Now for the weird bit, while the video camera was playing I unplugged one of the audio leads and the video screen went almost black and the image scrolled about on it. I plugged it back in and it the video came back on. I checked and double check and it does not matter if I disconnect either of the L/R phonos it makes the video go off.
Which is really odd as they are two different systems! Why would unplugging the audio make the video go off? Any ideas?
(To be sure it was not the video camera I tried the same test indoors on the TV and it was fine, the picture will display if just the video output is plugged into the TV.)
Also the extreme Mac Roadshow cable I wrote about seems not to work with a iPod Touch, I tried it indoors connected to the TV and it outputs audio only 
Mat