I travel every week for work. Travel apps are a necessity. Here are my top 5 and how I use them:
1. Flight Track Pro - a must for those that fly. I can keep updated flight delays, gates, etc to always know where I am going. Works great since it syncs flight data with...
2. TripIt - Handles all of my travel documentation. I simply forward flight and hotel information and they pre-populate all relative confirmation numbers, etc. Best of all, they have an iCal feed that integrates amazing with...
3. Calendar.app - Keeps all of my appointments synced with my company's Exchange server. The TripIt iCal feed is always updated with hotel information and flight information as well. I get a great view of how my week will shape up.
4. AccuWeather - Always nice to be able to see the 15 day forcast for a city. I never like being surprised by the weather, so I know if I need to bring any special gear to make sure I stay dry and warm.
5. SplashShopper / Zenbe Lists - I've created a robust packing list so I never have to think about what I need to pack. Makes packing more efficient and gives me more personal time and peace of mind to know I didn't forget anything.
Of course I use others (GateGuru is pretty darn cool), but those are my top 5. If I was allowed to add more I'd add:
--GateGuru - Yelp for Airports. Works as advertised.
--Reeder - keep updated on all of my feeds
--Alarm Clock - I never trust the hotel alarm clock and hate having the phone ring for a wake up call
--Google Maps - for the obvious reasons
--Siri - always nice to have a personal assistant traveling with you
--Kindle for iPhone - great to be able to pick up reading if my Kindle battery dies
--ESPN Radio - I need my sports fix in the morning
--Games - pick you personal preference on a game, but having entertainment is key.
So, even though our Fearless Leader asked for 5, I gave 13. And I could give more of course...