The big keyboard is great for typing addresses in while the phone is on a car dashboard.
The separate numbers are dead useful if you live somewhere like the UK, with number /letter postal codes, as you don't have to keep switching to get the number bits.
Works great from Google Car Home.
Supports launching Google Navigation or Google Maps.
Choose UK/US and French and German keyboard layouts, or set your own custom layout.
Also supports working as an input method for use with any other in car navigation application. You can use an app such as Tasker to automatically switch input method when your phone is in car mode.
I don't like posting apk files, so it is free on the market, it is called quickgo.
Any comments / bug reports etc. welcome.