HearPlanet: Audio Guide to the World $4.99
This app's developer is doing us all a favor by releasing this free travel app. Using this app while you're travelling is like having a personal tour guide. It's a tour book in your iPhone covering more than 250,000 locations with continuous updates. It tells you what the areas nearby through geolocation are. It's got a useful search tool embedded within the app. But this app's best feature is the fact that it lets you hear the travel-related information.

Currency Pro $9.99
Of course, the most important thing to consider when you're traveling is money. This app lets you find out the current exchange rate in the country you’re going to. It covers over 90 currencies in 100 countries. If you're a frequent traveler, this app is certainly a must have for your iPhone.

Speakin Jamaican $0.99
If you're specifically traveling to Jamaica you'll find this language translator a really fun app to play with. It translates your sentence into Jamaican Slang and uses Rasta Lingo with Jamaican accent. The creators of this app also have versions for other countries.

Room FREE
If you find it hard to remember your room number after you've checked-in a hotel, you might find this app useful. It's a simple app that lets you store your room number and then it displays the number on the app icon that appears on your iPhone's app screen. Simple and yet useful.

Language Translator FREE
Aside from currencies, it will also be useful if you can speak some of the basic conversational phrases of the country you are visiting. You'd certainly find many instances when you'll use this app. Using Google translate, this app lets you translate words, phrases, sentences and even whole paragraphs between different languages.

Wi-Fi Finder FREE
This app offers the largest directory of paid and free Wi-Fi hotspots in 135 countries worldwide. If you're in the middle of a business trip and needed to check on your office email quickly, let your iPhone find out if you're in a Wi-Fi hotspot. That way, you don't need to turn on your laptop only to find out that the area has no hotspot. This app uses the GPS function of your iPhone to locate the hotspot.

Choice Hotels Locator FREE
This top hotel locator app helps you find the best hotel accommodation for you. It covers more than 5,800 choice hotels worldwide and lets you view hotel photos, get hotel details and amenities, get door-to-door directions and more.

WorldView FREE
Who would have thought that a diminutive gadget such as an iPhone can allow you to take a glimpse of the whole world through webcams? Believe it or not this app does. It lets you view cached images of over 9000 webcams worldwide. It even allows you bookmarks your favorite webcams and see how the images changes. Want something cooler? This app lets you reload the list of webcams just by shaking your iPhone.

Traveler (Basic) FREE
This full-featured app gives various travel information including travel guides, hotel and restaurant reviews in various cities worldwide. The app's travel guide section was written by fellow travelers, while the reviews were culled from various hotel and restaurant review publications. One fun feature of this app is a facility for letting you show off all the places you've been to. It supports various social networks such as MySpace, Orkut, Hi5 and more.

World Nomads Japanese Language Guide FREE
Here's another language-specific translator, this time useful if you're traveling to Japan. This app is just one in the series of WorldNomads language translator. It contains conversational Japanese language lessons.