Cool, zac. Good idea Neophiliac.
You saw the thermal camera they used at Turkey. It would be ideal to enhance the visibility of cars, specially when raining. Well, just another idea whose time, maybe, has come.
There are these new LCD panels called "transflective" panels that can be seen even in direct sunlight. They were launched last December, that's what got me thinking: 1500 candles per square meter, that's a lot.
I've read from people with convertibles (at some forums) that the CTF-700 model is the best of the transflective screens.
The guy that posted this image claims that is much better "in person" and that this picture was gotten without any contrast adjustment. Notice how the upper screen is practically invisible. Both screens are transflective, but the best (according to the owner) is the bottom one.
Finally, I think that sometime in the future, the camera or sensors and the PC onboard will be able to show you the relative position of all cars around you (not just an image, but a representation of where are them in relation to you), taking the place of NASCAR spotters. After all, GPS are really precise these days, so, in theory, you wouldn't even need a camera: if you could get the GPS info of other cars you could have even an audible tone, a beep or something, to warn you that there is a car alongside you (or that another car will be alongside you in a few moments).
Here you have another pic: the screen at the top is a Motorcity transflective, not as good as the CTF model.