TripIt – links to your email and puts all emails that have a confirmation number into one place.
Google Translate – self-explanatory.
Flight-aware – tells you exactly where your plane is.
Skype – call phones for cheap, or for free if the person you're calling has Skype too.
Next Flight – tracks scheduled departures from 1,100 airlines.
OpenTable – allows you to make reservations in more than 13,000 restaurants in the US and abroad.
Obviously, there are tons and tons more. Make sure to check out those lists. Could find something useful.
...Also – if nothing else, take a look at this Travel and Leisure article. They didn't just make a list – they analyzed what's available for Androids, iPhones and Blackberrys, and they compiled a list of 53 "favorite" apps.
by Fedor Zarkhin