Jailbreakers, go forth and prosper. Keep an eye out here for a forthcoming howto video.
From the dev team:
PwnageTool 3.1 for Mac OS X – this application supports the iPhone 1st Generation (2G), the iPhone 3G and the iPod touch 1G. NB: THIS DOES NOT SUPPORT THE 3GS OR 2G/3G IPOD TOUCH. redsn0w for Mac OS X and Windows will follow sometime in the near future, please don’t bug us about it – we’ll release when we have something ready.
While they aren’t citing an exact date, TomTom has updated it’s FAQ page to say that it’s iPhone Car Kit will be available in October. It’ll be available initially without the app, which also works on the iPod Touch. Need the app? Get it here.
Source

We know it’s coming, but the question remains.. “when?”
Well, it may be pretty soon. TomTom’s iPhone app (iTunes link) by itself is without a doubt, simply awesome. The mount just takes it one step further. It’s packed with goodies including the ability to charge your iPhone, Bluetooth for hands-free calling, and it’s own SiRFstar GPS chipset for better accuracy as compared to the app by itself. Want more? I thought so. Here is a link to the FCC’s site to keep you quite busy including more photos, test reports, and even the device’s manual.
*UPDATE*
Here’s a video of the device in action.
Don’t have an iPhone? Well, would you like one for free?