Kayak.com – one of the easiest and most used travel search engines, just released on app for the iPhone.

If you’re stuck at an airport, absent from home, or away from a computer, you can easily search for flights and hotels via an interface that’s better designed for a mobile device.  Makes for a nice tool when changing travel plans on the go.

One handy feature is a list of all airlines’ phone numbers. It would be worth downloading for this feature alone.

Using the GPS it will also supply nearby airport info, so if you don’t know an airport code, or are kidnapped and unsure of what city you’re in, it will find the nearest airport to you.

Press release from Kayak’s blog.

Cnet has a detailed review pointing out additional positives and negatives.