On Adioso (adioso.com), not only will you be able to use the traditional queries such as destination and dates, but you will also be able to type in the city you are leaving from, the city you want to get to and the dates of your arrival and departure into a search box to see suggestions for different flights. Although the prices on Adioso are pretty good, it must be said that there are cheaper websites to book your flights from. However, Adioso's co-founder, Tom Howard, announced recently that there would be a price-drop coming soon on the website.
