The apps I have in my iPod that could be useful are (I'm not listing websites, you can do Googles on those :P)

* Accuweather .. of course
* Google mobile app ... You can save docs, have your tasks, calendar, etc
* YP mobile .. in case you need a phone number in the area
* Wi-fi finder & Free Wi-fi finder ... although I think most people know where the wi-fi hot spots are
* Maps & Mapquest
* A Personal Assistant ...
* Flight sites & Airport Status .. to check flight times and make sure there are no delays or anything
* Evernote ... I haven't used it yet but it's supposed to be great for notes/productivity

Then I have a number of food-related apps like GoodFood, OpenTable, LocalPicks, FastFood, Have2Eat, and Urbanspoon. As well as Dunkin Run because I want Dunkin donuts while I'm there ;)

I have a couple of drink apps, if I decided to order something fruity and strong at the Hyatt bar


* UPackitit Free .. for my packing list
* My eSleep Lite and Sleepmaker to help drown out noise when I want to sleep

Then my social networking apps, and Flickr and Photobucket apps, plus games for when I'm in line