Continuous innovation has fueled the rapid growth of online travel information and commerce. Even now—after the market has achieved a measure of maturity—would-be Internet millionaires keep searching for The Next Big Thing. Peer-to-peer interactions? Searches tailored to individual interests? Search engines with value-added information? All of the above, and even more, are at play. Here are 10 new websites that stand out for their originality and that ordinary travelers might actually want to use.