The Vroom Tire Tread Pattern Case for iPhone 3G by Case-Mate is made of impact-resistant rubber. With your purchase, you get the rubber case, screen protector, a card to squeeze out bubbles while installing the screen protector, and a micro cleaning cloth.
The average customer review is about 3.5 out of a possible 5.0. The drawbacks aren't enough to cause anyone to regret their $15 purchase and the case gets high marks for its coolness factor.
Implications - Personally, I think that's a pretty solid deal. People spend hundreds of dollars on iPhones, and what's the point in having something if you don't spend the money to protect it?
The Case-Mate 'Vroom Tire Tread Pattern' case is on sale now.