Comparison-Shopping in Online Travel

Super Search: http://itasoftware.com/

US:

Consolidated
Expedia.com
Travelocity.com
Orbitz.com

Airfare comparison:

Kayak.com
Sidestep.com
Mobissimo.com

International airfare:

from US to China:

UK: http://www.travel.co.uk/

The challenge from