I first took a look at the Skobbler crowd sourced GPS app for iPhone back in June of 2010. I found it uneven in quality, but it was free, and if you weren't going to spring for one of the big boys like Garmin, Navigon or TomTom it was worth a try.
Skobbler has now been updated, and it costs US$0.99. The app has been renamed GPS Navigation 2. Your dollar gets you US and Canada maps in a unive
