The Shippo Tracking PHP Sample Code by Shippo demonstrates how to integrate tracking data into a shipping application. The code allows accessing tracking information about a shipment using carrier and a tracking number.
When we wrote about APIs fueling an "instant" frenzy, there were only four mashups in our directory tagged instant. We've added more than that just this week, taking our total to 16 instant mashups. But the most common type of instant mashup may surprise you.