TomTom has done a respectable job of keeping its iPhone GPS app up to date when compared to formidable options from Navigon and the like, but today it's making its biggest move yet by way of a significant price drop. We've heard directly from the company (and confirmed with our own two peepers) that the US and Canada version of the app is now on sale for $69.99, while a US-only version is currently on sale for just $49.99. If you'll recall, the former was just selling for
