Here we are, in August 2007, and I can build truly useful web applications using API's from Amazon.com, Google, Facebook, and MSN Live, just to name a few.
But why is there no easy, well-documented REST-based API to do travel searching and booking?
Travel is one of the first, and is still the leading, e-commerce applications on the Internet in terms of dollars spent. Yet if I want to build a Facebook application to shop for airfares, or an Amazon.com payment-based way to book hotels or gift travel, I cannot do so.
It amazes me that this is not available yet. Are you listening, Expedia? Orbitz? Travelocity?