50 ultimate travel apps ... so far

by Rick Martin

There is of course one smartphone app no true traveler could ever do without. This one. 

But once you've downloaded that, why not browse these too?

We're going to skip over obvious ones like Twitter, Facebook, Skype, Gowalla, Foursquare, Instagram, Google Earth/Maps, as worthy as they are, for ones you may have overlooked, but shouldn't. 

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1. Kayak -- Flight search

More than a few trips begin with Kayak, one of the web's most popular travel services. Its mobile apps are great as well, allowing you to search flight details with ease on a mobile device.

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