Air Couriers

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. - 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!