Kayak, the popular meta-search website, has created an app that makes it easy to search for hotels, flights and car rentals even while you're away from your desk. Budding road warriors will appreciate the airport information section, price alerts and fee table, while bean counters will appreciate that the app comes in a free, regular version. High flyers wanting to book first- or business-class tickets will need the Pro version, however, priced at $1.99.