The search results are separated by the best deals, last-minute flights, weekend and weeklong flights, and flights for families. There's also a section for the best deals nationwide to recommend to friends or family members elsewhere. Each deal has an arrow icon that tells you what's happening to the fare's price in the near future, along with a recommendation for or against a purchase.
The defining difference between Farecast Deals and other deals sites is content aggregation. Whereas other sites can get their deals from tipsters and marketers, Farecast actually populates them from its own data. Farecast claims it would take someone "50,000 individual searches" to find the deals they do, and that's just for one city.