Navigation junkies have been pining for Navigon's latest MobileNavigator application ever since our sneak preview at CTIA, but that wait is now over -- at least for iPhone constituents. To mark its arrival, the app was re-branded as Navigon 2.0, and yes, it's a free upgrade for current users. Most notably, the software now enables individuals to selectively load maps into their iPhone on a state-by-state basis -- thereby creating extra headroom for more important uses. Additionally, Navi
