Cheap Flights.co.uk
Offers a comparison of how much different courier firms and airlines charge for door-to-door luggage delivery.
http://news.cheapflights.co.uk/flights/2006/08/sending_luggage.html

DHL
An American express courier delivery firm with a worldwide reach.
http://www.dhl.com/

EC-Ourcity.com
Links to air courier and logistics companies.
http://www.ec-ourcity.com/AirCourier.htm

Exel
North American logistics company.
http://www.exel.com/

Fedex
One of the pioneers of the package delivery industry and still one of its biggest.
http://www.fedex.com/

Global Sources
Track parcels/cargo sent via TNT, UPS, Fedex or DHL.
http://www.globalsources.com/TNTLIST/CARGO.HTM

Hedleys Humpers
Specialises in the packaging and shipping of antiques. The company has a presence in London, New York and Paris.
http://www.hedleyshumpers.com/

International Air Transport Association
Information on the transportation of dangerous goods by air.
http://www.iata.org/cargo/dg/

Langenberg.com
Track your parcel or shipment online, search shipping rates or find drop-off and service locations.
http://shipping.langenberg.com/

Mail Boxes Etc
Retail shipping, postal and business services franchise company.
http://www.mbe.com/

Microsoft
Download free templates for printing a variety of labels and jackets such as address labels, shipping labels, audio cassette labels, etc.
http://office.microsoft.com/en-us/templates/CT011389781033.aspx

Package Mapper.com
Track the progress of your Fedex, DHL or USPS parcel on a map.
http://www.packagemapper.com/

TNT
Express delivery service.
http://www.tnt.com/

UPS
Track your packages online, find a pick-up or drop-off point, check delivery rates and more at UPS' homepage.
http://www.ups.com/

WOW
Global alliance of major air cargo carriers; comprised of Lufthansa, SAS, Singapore Airlines and JAL.
http://www.wowtheworld.com/

Yahoo!
Yahoo's index of air cargo service companies.
http://dir.yahoo.com/Business_and_Economy/Business _to_Business/Shipping/Cargo_Services/Air_Cargo_Services/