Coffee Finder I can always use a good cup of coffee... but I can't always find one. This app not only shows you where the nearest ten Starbucks shops are; it also tells you when each location opens and closes. Plus, you can filter your search to bring up only locations that offer certain extras, like drive-throughs or twenty-four-hour service.

Rain Alarm This rain alarm app does just what it says: alerts you to imminent rain or other precipitation. You also get a visual of the storm system and its movement. Really helpful if you don't want your day out on the town to be a wash.

MasterCard ATM Hunter I never, ever have enough cash on me, and often find myself just wandering up to any old ATM and getting hit with withdrawal surcharges. This ATM-finder app can be a lifesaver, especially because it allows you to search for your own bank's ATMs.

Store Finder Confession: I've been known to forget to pack necessities like toothpaste when I'm traveling. I use this app most often to find places like Walgreens and CVS--drugstores have everything!--but it can also direct you to a range of other stores, from Banana Republic to Big Lots and Target to McDonalds.

ZAGAT for Android Discovering restaurants is one of my favorite parts of exploring a new city, and Zagat is a pretty reliable indicator of quality meals and cheap eats. This app is just like carrying the guidebook around with you everywhere; you have access to all the Zagat ratings, themed Best Of lists, and diner reviews you could ask for, plus GPS directions.