GPS navigation on cell phones is quickly becoming a hot ticket, and carriers and map providers alike are wanting to get onboard. Case in point: MapQuest has launched a new mobile app called MaqQuest Navigator to deliver voice-guided, turn-by-turn directions to GPS-enabled Sprint and Nextel phones. Available as a downloadable app and at a cost of $9.99 per month (you'll also need a data plan), MapQuest Navigator offers full-color maps with zoom in and out, optimized route creation, automatic rerouting, access to 15 million points of interest, and more. We're anxious to try it out and compare it to Verizon's VZ Navigator service, so check back soon for a review. In the meantime, check out www.mapquest.com/mobile for more information.