[joedev]

http://www.google.com/flights

Select: departure airport, departure date, and return date (optionally price range). Do not choose a destination.

See: a map of destinations with price labels shown for major cities.

Set: the max price and see possible destinations fade away.

Click: on a destination dot on the map and instantly get details of available flights.

All without pressing a single "submit" button and without entering a single destination.

[akx]

Trying to select Helsinki as departure airport: "Sorry, locations outside the US are currently not supported."

Ah well.