Air and Surface - International
Clough - USA domestic only
First Flight Out - USA domestic only
Air Courier - International and traveler-friendly
Air Travelers FAQs - No glitz site for cheapest air travel advice
Fast Transportation - International
APX - International. Not a very helpful site.
Courier.org - Great all-inclusive traveler-friendly site with links to other traveler-friendly sites
The Filipino Pavilion and Travel Emporium - Helpful information for us wannabe couriers
The Air Courier List - Membership based. List of courier companies.
??? - Not sure what this is, but has company names/phone numbers and popular destinations
Courier Travel - Actually lets you see what flights are available now based on dep and arr cities
Beat the Monkey - Not sure about this one. Costs $6 for a list. That's all they provide...
Air Courier Travel Club - Looks like great prices!