My iPhone 3G normally resides in a case of some sort-the iFrogz 3G Luxe for normal use, and the Incase Power Slider when using the iPhone for GPS during a round of golf. (Sadly, the Power Slider is out of production now; you may be able to find leftovers at Best Buy, Target, or the Apple Store. It does a great job at making battery life a non-issue, even during five hours of intense GPS use.)
Apple has taken a bit of a break following the last round of iPhone 3G releases in late September, but the iPhone 3G may appear in a few more countries before the end of the year. Late last week and over the weekend, two carriers announced that they have signed deals with Apple to distribute the iPhone 3G. Specifically, carriers in Thailand and Taiwan said that they have signed deals with Apple, although the details differ somewhat.