Kayak.com/h/buzz/flights

There are loads of services that track down cheap airfares, but this is the only one we've seen so far that mashes it up with Google maps. Drop in your departure city, the region you're traveling to, and even a theme (skiing, golf, or gambling, of course), then map it all out. It's not necessarily the most precise method of finding good fares — just one of the most fun. -Mark Mangan