Airport Revenue News
Contains surveys of the best airports for shopping and the best airport retailers.
http://www.airportrevenuenews.com/bestpoll/index.htm

Airport Shopping Safari
Johannesburg Airport shopping guide.
http://www.airportshopping.co.za/

Airwise.com
Airport shopping - past, present and future.
http://news.airwise.com/cgi-bin/page?name=features/airports/shopping.html

BAA - Tax Free Shopping
Duty and tax free shopping has not been abolished entirely in Europe, it just depends on whether you are flying within the EU or outside it. Find out more about the changes and what they mean at this site.
http://www.baa.co.uk/information/taxfree.html