Chalk up another two wins for cheap consumer GPS. Like Google Maps Navigation before it, the MapQuest 4 Mobile iPhone app has just now added gratis turn-by-turn voice directions and ahead of schedule, TomTom has begun bundling its new 2010 Personal Navigation Devices, including the XL 340S and the XXL 540S -- with lifetime traffic and maps subscriptions. The latter are now available on Amazon for a $30-per-lifetime-subscription premium in a variety of increasingly feature-filled flavors, with helpful T (traffic), M (maps) and TM (traffic
