I think this is key, because I do not need an update when my package has moved from state to state, especially because this tends to happen late at night or early in the morning and will wake me up. I love the status update of Out for Delivery or Delivered / Not Delivered, but should be able to track ALL status, or select which occurances you wanted to be pushed. I know there is a lot of carriers, then just do the major ones for now if you can. UPS / FEDEX is what everyone I know uses it for. USPS tracking is horrible on their part, I usually get the package and then get an update two days after receiving it. I have never had faith in their tracking.