Hipmunk serves a niche within the industry by providing travel and flight info in a unique way, and they do it well. As the story notes, they won't necessarily

Hipmunk serves a niche within the industry by providing travel and flight info in a unique way, and they do it well. As the story notes, they won't necessarily find the cheapest flight or present the most flight options. I think it is a good case study of a service succeeding in a narrow segment as opposed to trying to be the end-all, be-all provider.