This could be a sensitive, touchy subject and also interesting at the same time depending on how you're looking at the topic. I've got a black audi sitting on a road side curb where NO car usually sits. Something about this AUDI is not right... On an interest hunt, i went onto a portal and hit up on some car camera sites. !!... Audi has a in-house 'rear-view' camera feature. I don't know what propety laws actually govern cars as they do house or residential properties or which is a subset with lessor applicability rights but it would be interesting if someone hasn't turned it into a surveillance tool of another sort aside for the prime one it was designed for rear-viewing while driving or tool to aid in rear-vehicle collisions or the avoidance thereof.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic