So has anyone built a site that lets you put limit orders on airline seats yet? I'd love to, say, have something automatically book a $250 flight across the country if the price happens to cross that threshold in the next week.
We've been considering doing that at hitlistapp.com. For now, we just send you alerts when we find deals that we've determined are good (or great or spectacular), based on a proprietary algorithm for determining good deals that takes into account time to booking, price fluctuations throughout the year, and how desirable the destination is for you.
We're different from Kayak or Yapta alerts in that you don't have to set alerts for a specific destination/time - you can search for things for, say, '7-10 day trips to South America between January 4th and 30th' or 'a long weekend in Austin in the next quarter'.
> 1.as a consumer its hard to do more than "technical analysis" on a chart of the ticket price to figure out where to set your limit order
You don't do any analysis on the price. You just introspect, and figure out what is cheap enough to make you get up and fly, and that's the price you set.