I can't say I'm a huge traveler -- even though I've hit up quite a few conventions this year for work, I haven't been flying so much that I need to keep tabs on what's going on at the airport. But I like the idea of FlightBoard anyway -- it's an app that will automatically create a departing flights board for any airport in the country, so you can see flight numbers, gate arrivals, and departure times for all the flights in the airport.
Like I said, I personally don't fly enough that I'd necessarily need an app just for this, but if you find yourself running off to the airport a lot for a certain reason, this app seems like it would be very helpful. Even beyond the specific function, I like the idea and design of