A must have App for the iPhone is the Journey browser. It works much better with icrew and travelnet, enabling all the functions.

Also, Google App, which allows to to speak into the phone to seach the Internet. Good for fat fingerred Or lazy typers.

There are good online banking apps, and financial apps. I like bloomberg or CNBC.

GPS map is great, search on it for anything, and it puts the location on the map with a Red Pin. Traffic for driving, etc.

Accuweather and Aeroweather Apps.

HaveToEat and HaveToDrink for finding eat and bar places. I find it better than Urbanspoon.

Finally, USAToday AutoPilot which tracks your flights with all the info you need, such as gates and even your filed routing!

Then the games. ....... But you can play with that.

Hope that helps.