Twitter (Android, BlackBerry, iOS, Windows Phone; free)
Travel may not immediately come to mind when you think about Twitter, but you can find plenty of useful tips and deals on the microblogging service if you know who to follow. For JetBlue faithful, @JetBlueCheeps tweets last-minute airfares every Tuesday. Airfare Watchdog (@airfarewatchdog) covers all airlines and tweets daily with deals based on specified location and destination. If only luxury will do, check out @GetATravelDeal. It's also prudent to follow location-specific accounts--for example, @gohawaii and @HawaiianFares--if you have a particular destination in mind. Don't want to put in the legwork? Try TripTwit, which finds the best Twitter travel deals and reports them in a daily email message.
Where (Android, BlackBerry, iOS, Windows Phone; free)
Once you've reserved your last-minute flight and found a top-notch hotel for your stay, fire up Where to help you find the best local spots for dining, entertainment, and shopping. The app uses your device's built-in GPS to map out nearby restaurants, bars, and shops. It also includes a social feature that lets you save and share your favorite places and get recommendations from friends on where to go. As a nifty bonus, a built-in weather tracker helps you plan your activities with an eye on the elements. And an offers section populates deals based on your location, enabling you to find food and fun even more easily.
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