Most of the cheaper car chargers used the "firewire" method to charge your iPhone and worked with the first iPhone. The new 3G does not support this. The above mentioned firewire method used all 12 volts off of the car battery to charge the iPhone, the new iPhone only uses 5 volts. Apple does not let the older chargers work in the new iPhone thus not frying it.
Griffin has a nice one that works for $20 - available in the store on this site.
I have one on order.
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