According to eyefortravel.com, Travelocity is enabling RSS feeds to notify subscribers when there is a lower fare. Here's another great example of an application of RSS. This shows further evolution of the next phase of the internet. When the web started catching on people surfed. As the number of websites continued to grow, people searched. We are starting to see the next phase where people will subscribe.
"Each day, Travelocity searches thousands of flights to identify low fares. Travelocity's new RSS feed will ensure that when Travelocity finds a low fare to a subscriber's favorite destination, an alert is communicated to that subscriber through their RSS news reader of choice (i.e., My Yahoo!, My MSN, NewsGator, Pluck, etc.). Subscribers simply create a personalized RSS feed by selecting their own customized list of preferred destinations or choosing from Travelocity's recommended destinations by trip type. As subscribers review their daily RSS reader, Travelocity's feed will provide customized travel information, news on discounted fares, and special offers. When they're ready to check availability for a flight, one click takes them directly to Travelocity."