FlightTrack — Ever wondered where in the world your flight is? FlightTrack offers a ready answer, allowing you to follow any flight worldwide. You can scan live flight maps that include weather radar, check gate numbers, and search flight schedules up to 11 months in advance. This nifty app even allows you to send an email update with your flight status to a friend or colleague. The basic version of this costs $4.99.
WorldMate — For most business travelers, WorldMate needs no introduction. Its new iPhone app offers a variety of must-have features for any traveler, including a currency converter, flight updates, integration with Google maps, and an online travel planner with the ability to consolidate your itinerary. Some of the more advanced functions require that you plunk down $39.99 for the “gold” app, but if you travel a lot, it’s worth the investment.