Kayak - Google Mashup

A cool new service from Kayak who have presented their most popular searches from any city in a visual way using Google Maps.

Using AJAX and DHTML to provide as interactive a service as possible they have a nice simple method of getting a list of possible destinations. The way their slider and sort by columns are implemented has a nice desktop application feel to it. This coupled with the Google Maps integration I think is an excellent way of presenting to the user something that they are unsure of.