Lists of price comparison services

Global

Flights

• http://www.skyscanner.net - searches 1,000+ airlines for best deals

Hotels

• http://directrooms.com - meta search engine for hotel accomondation. Scans 250+ hotel booking sites for best rate on given hotel.
• http://www.trivago.com - meta search engine for hotel accomondation. Scans 130+ hotel booking sites for best rate on given hotel.

Australia

• http://www.getprice.com.au/

Europe

Finland

• http://www.vertaa.fi - mostly electronics price comparisons but also other fields

UK

• http://www.mysupermarket.co.uk - View prices and shop in w:Asda, w:Sainsbury's, w:Tesco, Whiterose and Oscado
• http://www.pricechecker.co.uk/
• http://www.pricerunner.co.uk/
• http://uk.shopping.com/ - by Ebay

North America

USA

• http://www.bizrate.com/
• http://shopper.cnet.com/ - by cnet
• http://www.nextag.com/
• http://www.pricegrabber.com/