The document discusses the travel booking sites Hotwire and Priceline. It provides an overview of the author's experience using the sites, particularly for hotel and rental car bookings. Key details covered include the tradeoffs of opaque vs transparent booking options, strategies for bidding on hotels and cars through Priceline to maximize savings, and important considerations like fees, cancellation policies, and elite status recognition when using these sites. The author provides tips and strategies based on their extensive use of Hotwire and Priceline over many years of travel.