Who needs a tracking service when you can just hop on the USPS, FedEx, UPS, or DHL website (or whoever your carrier is) and just track? Maybe you. The Trackthis API integrates an amazing array of functions into your application. The API webpage lists over 10 carriers you can get notifications for.
While many are excited about live traffic data on firm ground, others have turned their attention to the other 3/4 of the earth. According to The Map Room, many ships are required to carry transponders to broadcast their location. The result is a lot of public marine data and the perfect situation for a classic map mashup.
DropBuddies, the Postmates of Nigeria, launched an API that allows local businesses to include courier services directly within their apps. Without leaving the integrated business' app, users get a delivery quote, ETA, and book a delivery. Once booked, users can track shipments through delivery.