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The app, Kayak Explore for Mac [Mac App Store link] is free and available in the Mac App Store. It's an expanded version of the "Explore" feature on Kayak.com, but it adds a better user interface and options like sorting by type of trip. You can choose what time you want to travel or find optimum travel times for your intended destination.
Users are given an overview of various hotel and flight options for their trip, including access to reviews and photos. A flight or trip can then be booked on the web by clicking on the app.
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We played with the app briefly and were impressed with its speed and ease of use. It certainly makes planning a trip or looking at vacation options more pleasant.