You can still buy tickets through Orbitz, Travelocity or any other site and get their fares and frequent-flyer miles. Mobissimo just does the research and lets you choose. Some flights shown are from overseas providers and may be listed in foreign languages, but Mobissimo converts everything to U.S. dollars.
Entrepreneur Beatrice Tarka was commuting between France and California every month and finding the websites on which she booked her flights totally frustrating. So she decided to start her own. The result, mobissimo.com, may turn out to be the Google of travel searches: a lightning-fast way to comparison-shop among all the booking services. No selling. No scams. No charge.