Package Tracker does just that: track packages (see Figure 6). It works with FedEx, UPS, and DHL tracking numbers.
Figure 6 The Package Tracker widget.
Click a button to specify the service used to ship the package, enter the tracking number in the box, and press Return. After a moment, Package Tracker displays tracking information. There's nothing to configure; it's all set to go as is.
Package Tracker is by Monkey Business Labs.