I love my new speck tire tread case (that's what I call it) however the belt clip housing lasted exactly 1 week and the clip broke when I sat down in the car. It was a very low impact type move and it snapped like a twig.
Originally I purchased it for the belt clip feature and also to protect the phone. I found that I can do without the belt clip and really like how the case looks and feels.
I found a car mount that works perfectly with this case that is made by Pro Clip
Their mounting system is 2 fold. First you select the mount for your specific car, and then you pick the holder for your specific phone. I purchased the following items for my 2004 Explorer and it is the best mount I have ever had for a car. The thing I like about it is that if you change cars but have the same phone you just purchase the correct mount for the car, and use the same holder for your phone as they all couple together the same way.
Heres the links:
http://www.proclipusa.com/home/home.aspx
Iphone 3g Adjustable Mount for Speck & Iskin cases:
http://www.proclipusa.com/?sectionpa...p_leftorright=
Mount for my 2004 Explorer (look up your vehicle if you wish)
http://www.proclipusa.com/?sectionpa...p_leftorright=
Their stuff is a little pricey but worth every dollar. The mount is rock solid and is made specifically for the phone and your car.