9 Sites With Killer Search Functionality

Stephanie Buck at Mashable rounds up a list of 9 Sites With Killer Search Functionality. Each of these features a unique interface with unusual options for maximizing search. I love the idea of being able to sort by color, I can see this being an asset for many different shopping sites, as well as possibly libraries – how many times has someone come to the reference desk and asked for the edition with the green cover?